drivers/usb/host/xhci-ring.c

   1 /*
   2  * xHCI host controller driver
   3  *
   4  * Copyright (C) 2008 Intel Corp.
   5  *
   6  * Author: Sarah Sharp
   7  * Some code borrowed from the Linux EHCI driver.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16  * for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software Foundation,
  20  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 /*
  24  * Ring initialization rules:
  25  * 1. Each segment is initialized to zero, except for link TRBs.
  26  * 2. Ring cycle state = 0.  This represents Producer Cycle State (PCS) or
  27  *    Consumer Cycle State (CCS), depending on ring function.
  28  * 3. Enqueue pointer = dequeue pointer = address of first TRB in the segment.
  29  *
  30  * Ring behavior rules:
  31  * 1. A ring is empty if enqueue == dequeue.  This means there will always be at
  32  *    least one free TRB in the ring.  This is useful if you want to turn that
  33  *    into a link TRB and expand the ring.
  34  * 2. When incrementing an enqueue or dequeue pointer, if the next TRB is a
  35  *    link TRB, then load the pointer with the address in the link TRB.  If the
  36  *    link TRB had its toggle bit set, you may need to update the ring cycle
  37  *    state (see cycle bit rules).  You may have to do this multiple times
  38  *    until you reach a non-link TRB.
  39  * 3. A ring is full if enqueue++ (for the definition of increment above)
  40  *    equals the dequeue pointer.
  41  *
  42  * Cycle bit rules:
  43  * 1. When a consumer increments a dequeue pointer and encounters a toggle bit
  44  *    in a link TRB, it must toggle the ring cycle state.
  45  * 2. When a producer increments an enqueue pointer and encounters a toggle bit
  46  *    in a link TRB, it must toggle the ring cycle state.
  47  *
  48  * Producer rules:
  49  * 1. Check if ring is full before you enqueue.
  50  * 2. Write the ring cycle state to the cycle bit in the TRB you're enqueuing.
  51  *    Update enqueue pointer between each write (which may update the ring
  52  *    cycle state).
  53  * 3. Notify consumer.  If SW is producer, it rings the doorbell for command
  54  *    and endpoint rings.  If HC is the producer for the event ring,
  55  *    and it generates an interrupt according to interrupt modulation rules.
  56  *
  57  * Consumer rules:
  58  * 1. Check if TRB belongs to you.  If the cycle bit == your ring cycle state,
  59  *    the TRB is owned by the consumer.
  60  * 2. Update dequeue pointer (which may update the ring cycle state) and
  61  *    continue processing TRBs until you reach a TRB which is not owned by you.
  62  * 3. Notify the producer.  SW is the consumer for the event ring, and it
  63  *   updates event ring dequeue pointer.  HC is the consumer for the command and
  64  *   endpoint rings; it generates events on the event ring for these.
  65  */
  66
  67 #include <linux/scatterlist.h>
  68 #include <linux/slab.h>
  69 #include "xhci.h"
  70
  71 static int handle_cmd_in_cmd_wait_list(struct xhci_hcd *xhci,
  72                 struct xhci_virt_device *virt_dev,
  73                 struct xhci_event_cmd *event);
  74
  75 /*
  76  * Returns zero if the TRB isn't in this segment, otherwise it returns the DMA
  77  * address of the TRB.
  78  */
  79 dma_addr_t xhci_trb_virt_to_dma(struct xhci_segment *seg,
  80                 union xhci_trb *trb)
  81 {
  82         unsigned long segment_offset;
  83
  84         if (!seg || !trb || trb < seg->trbs)
  85                 return 0;
  86         /* offset in TRBs */
  87         segment_offset = trb - seg->trbs;
  88         if (segment_offset > TRBS_PER_SEGMENT)
  89                 return 0;
  90         return seg->dma + (segment_offset * sizeof(*trb));
  91 }
  92
  93 /* Does this link TRB point to the first segment in a ring,
  94  * or was the previous TRB the last TRB on the last segment in the ERST?
  95  */
  96 static bool last_trb_on_last_seg(struct xhci_hcd *xhci, struct xhci_ring *ring,
  97                 struct xhci_segment *seg, union xhci_trb *trb)
  98 {
  99         if (ring == xhci->event_ring)
 100                 return (trb == &seg->trbs[TRBS_PER_SEGMENT]) &&
 101                         (seg->next == xhci->event_ring->first_seg);
 102         else
 103                 return le32_to_cpu(trb->link.control) & LINK_TOGGLE;
 104 }
 105
 106 /* Is this TRB a link TRB or was the last TRB the last TRB in this event ring
 107  * segment?  I.e. would the updated event TRB pointer step off the end of the
 108  * event seg?
 109  */
 110 static int last_trb(struct xhci_hcd *xhci, struct xhci_ring *ring,
 111                 struct xhci_segment *seg, union xhci_trb *trb)
 112 {
 113         if (ring == xhci->event_ring)
 114                 return trb == &seg->trbs[TRBS_PER_SEGMENT];
 115         else
 116                 return TRB_TYPE_LINK_LE32(trb->link.control);
 117 }
 118
 119 static int enqueue_is_link_trb(struct xhci_ring *ring)
 120 {
 121         struct xhci_link_trb *link = &ring->enqueue->link;
 122         return TRB_TYPE_LINK_LE32(link->control);
 123 }
 124
 125 /* Updates trb to point to the next TRB in the ring, and updates seg if the next
 126  * TRB is in a new segment.  This does not skip over link TRBs, and it does not
 127  * effect the ring dequeue or enqueue pointers.
 128  */
 129 static void next_trb(struct xhci_hcd *xhci,
 130                 struct xhci_ring *ring,
 131                 struct xhci_segment **seg,
 132                 union xhci_trb **trb)
 133 {
 134         if (last_trb(xhci, ring, *seg, *trb)) {
 135                 *seg = (*seg)->next;
 136                 *trb = ((*seg)->trbs);
 137         } else {
 138                 (*trb)++;
 139         }
 140 }
 141
 142 /*
 143  * See Cycle bit rules. SW is the consumer for the event ring only.
 144  * Don't make a ring full of link TRBs.  That would be dumb and this would loop.
 145  */
 146 static void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring, bool consumer)
 147 {
 148         unsigned long long addr;
 149
 150         ring->deq_updates++;
 151
 152         do {
 153                 /*
 154                  * Update the dequeue pointer further if that was a link TRB or
 155                  * we're at the end of an event ring segment (which doesn't have
 156                  * link TRBS)
 157                  */
 158                 if (last_trb(xhci, ring, ring->deq_seg, ring->dequeue)) {
 159                         if (consumer && last_trb_on_last_seg(xhci, ring,
 160                                                 ring->deq_seg, ring->dequeue)) {
 161                                 if (!in_interrupt())
 162                                         xhci_dbg(xhci, "Toggle cycle state "
 163                                                         "for ring %p = %i\n",
 164                                                         ring,
 165                                                         (unsigned int)
 166                                                         ring->cycle_state);
 167                                 ring->cycle_state = (ring->cycle_state ? 0 : 1);
 168                         }
 169                         ring->deq_seg = ring->deq_seg->next;
 170                         ring->dequeue = ring->deq_seg->trbs;
 171                 } else {
 172                         ring->dequeue++;
 173                 }
 174         } while (last_trb(xhci, ring, ring->deq_seg, ring->dequeue));
 175
 176         addr = (unsigned long long) xhci_trb_virt_to_dma(ring->deq_seg, ring->dequeue);
 177 }
 178
 179 /*
 180  * See Cycle bit rules. SW is the consumer for the event ring only.
 181  * Don't make a ring full of link TRBs.  That would be dumb and this would loop.
 182  *
 183  * If we've just enqueued a TRB that is in the middle of a TD (meaning the
 184  * chain bit is set), then set the chain bit in all the following link TRBs.
 185  * If we've enqueued the last TRB in a TD, make sure the following link TRBs
 186  * have their chain bit cleared (so that each Link TRB is a separate TD).
 187  *
 188  * Section 6.4.4.1 of the 0.95 spec says link TRBs cannot have the chain bit
 189  * set, but other sections talk about dealing with the chain bit set.  This was
 190  * fixed in the 0.96 specification errata, but we have to assume that all 0.95
 191  * xHCI hardware can't handle the chain bit being cleared on a link TRB.
 192  *
 193  * @more_trbs_coming:   Will you enqueue more TRBs before calling
 194  *                      prepare_transfer()?
 195  */
 196 static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring *ring,
 197                 bool consumer, bool more_trbs_coming, bool isoc)
 198 {
 199         u32 chain;
 200         union xhci_trb *next;
 201         unsigned long long addr;
 202
 203         chain = le32_to_cpu(ring->enqueue->generic.field[3]) & TRB_CHAIN;
 204         next = ++(ring->enqueue);
 205
 206         ring->enq_updates++;
 207         /* Update the dequeue pointer further if that was a link TRB or we're at
 208          * the end of an event ring segment (which doesn't have link TRBS)
 209          */
 210         while (last_trb(xhci, ring, ring->enq_seg, next)) {
 211                 if (!consumer) {
 212                         if (ring != xhci->event_ring) {
 213                                 /*
 214                                  * If the caller doesn't plan on enqueueing more
 215                                  * TDs before ringing the doorbell, then we
 216                                  * don't want to give the link TRB to the
 217                                  * hardware just yet.  We'll give the link TRB
 218                                  * back in prepare_ring() just before we enqueue
 219                                  * the TD at the top of the ring.
 220                                  */
 221                                 if (!chain && !more_trbs_coming)
 222                                         break;
 223
 224                                 /* If we're not dealing with 0.95 hardware or
 225                                  * isoc rings on AMD 0.96 host,
 226                                  * carry over the chain bit of the previous TRB
 227                                  * (which may mean the chain bit is cleared).
 228                                  */
 229                                 if (!(isoc && (xhci->quirks & XHCI_AMD_0x96_HOST))
 230                                                 && !xhci_link_trb_quirk(xhci)) {
 231                                         next->link.control &=
 232                                                 cpu_to_le32(~TRB_CHAIN);
 233                                         next->link.control |=
 234                                                 cpu_to_le32(chain);
 235                                 }
 236                                 /* Give this link TRB to the hardware */
 237                                 wmb();
 238                                 next->link.control ^= cpu_to_le32(TRB_CYCLE);
 239                         }
 240                         /* Toggle the cycle bit after the last ring segment. */
 241                         if (last_trb_on_last_seg(xhci, ring, ring->enq_seg, next)) {
 242                                 ring->cycle_state = (ring->cycle_state ? 0 : 1);
 243                                 if (!in_interrupt())
 244                                         xhci_dbg(xhci, "Toggle cycle state for ring %p = %i\n",
 245                                                         ring,
 246                                                         (unsigned int) ring->cycle_state);
 247                         }
 248                 }
 249                 ring->enq_seg = ring->enq_seg->next;
 250                 ring->enqueue = ring->enq_seg->trbs;
 251                 next = ring->enqueue;
 252         }
 253         addr = (unsigned long long) xhci_trb_virt_to_dma(ring->enq_seg, ring->enqueue);
 254 }
 255
 256 /*
 257  * Check to see if there's room to enqueue num_trbs on the ring.  See rules
 258  * above.
 259  * FIXME: this would be simpler and faster if we just kept track of the number
 260  * of free TRBs in a ring.
 261  */
 262 static int room_on_ring(struct xhci_hcd *xhci, struct xhci_ring *ring,
 263                 unsigned int num_trbs)
 264 {
 265         int i;
 266         union xhci_trb *enq = ring->enqueue;
 267         struct xhci_segment *enq_seg = ring->enq_seg;
 268         struct xhci_segment *cur_seg;
 269         unsigned int left_on_ring;
 270
 271         /* If we are currently pointing to a link TRB, advance the
 272          * enqueue pointer before checking for space */
 273         while (last_trb(xhci, ring, enq_seg, enq)) {
 274                 enq_seg = enq_seg->next;
 275                 enq = enq_seg->trbs;
 276         }
 277
 278         /* Check if ring is empty */
 279         if (enq == ring->dequeue) {
 280                 /* Can't use link trbs */
 281                 left_on_ring = TRBS_PER_SEGMENT - 1;
 282                 for (cur_seg = enq_seg->next; cur_seg != enq_seg;
 283                                 cur_seg = cur_seg->next)
 284                         left_on_ring += TRBS_PER_SEGMENT - 1;
 285
 286                 /* Always need one TRB free in the ring. */
 287                 left_on_ring -= 1;
 288                 if (num_trbs > left_on_ring) {
 289                         xhci_warn(xhci, "Not enough room on ring; "
 290                                         "need %u TRBs, %u TRBs left\n",
 291                                         num_trbs, left_on_ring);
 292                         return 0;
 293                 }
 294                 return 1;
 295         }
 296         /* Make sure there's an extra empty TRB available */
 297         for (i = 0; i <= num_trbs; ++i) {
 298                 if (enq == ring->dequeue)
 299                         return 0;
 300                 enq++;
 301                 while (last_trb(xhci, ring, enq_seg, enq)) {
 302                         enq_seg = enq_seg->next;
 303                         enq = enq_seg->trbs;
 304                 }
 305         }
 306         return 1;
 307 }
 308
 309 /* Ring the host controller doorbell after placing a command on the ring */
 310 void xhci_ring_cmd_db(struct xhci_hcd *xhci)
 311 {
 312         if (!(xhci->cmd_ring_state & CMD_RING_STATE_RUNNING))
 313                 return;
 314
 315         xhci_dbg(xhci, "// Ding dong!\n");
 316         xhci_writel(xhci, DB_VALUE_HOST, &xhci->dba->doorbell[0]);
 317         /* Flush PCI posted writes */
 318         xhci_readl(xhci, &xhci->dba->doorbell[0]);
 319 }
 320
 321 static int xhci_abort_cmd_ring(struct xhci_hcd *xhci)
 322 {
 323         u64 temp_64;
 324         int ret;
 325
 326         xhci_dbg(xhci, "Abort command ring\n");
 327
 328         if (!(xhci->cmd_ring_state & CMD_RING_STATE_RUNNING)) {
 329                 xhci_dbg(xhci, "The command ring isn't running, "
 330                                 "Have the command ring been stopped?\n");
 331                 return 0;
 332         }
 333
 334         temp_64 = xhci_read_64(xhci, &xhci->op_regs->cmd_ring);
 335         if (!(temp_64 & CMD_RING_RUNNING)) {
 336                 xhci_dbg(xhci, "Command ring had been stopped\n");
 337                 return 0;
 338         }
 339         xhci->cmd_ring_state = CMD_RING_STATE_ABORTED;
 340         xhci_write_64(xhci, temp_64 | CMD_RING_ABORT,
 341                         &xhci->op_regs->cmd_ring);
 342
 343         /* Section 4.6.1.2 of xHCI 1.0 spec says software should
 344          * time the completion od all xHCI commands, including
 345          * the Command Abort operation. If software doesn't see
 346          * CRR negated in a timely manner (e.g. longer than 5
 347          * seconds), then it should assume that the there are
 348          * larger problems with the xHC and assert HCRST.
 349          */
 350         ret = handshake(xhci, &xhci->op_regs->cmd_ring,
 351                         CMD_RING_RUNNING, 0, 5 * 1000 * 1000);
 352         if (ret < 0) {
 353                 xhci_err(xhci, "Stopped the command ring failed, "
 354                                 "maybe the host is dead\n");
 355                 xhci->xhc_state |= XHCI_STATE_DYING;
 356                 xhci_quiesce(xhci);
 357                 xhci_halt(xhci);
 358                 return -ESHUTDOWN;
 359         }
 360
 361         return 0;
 362 }
 363
 364 static int xhci_queue_cd(struct xhci_hcd *xhci,
 365                 struct xhci_command *command,
 366                 union xhci_trb *cmd_trb)
 367 {
 368         struct xhci_cd *cd;
 369         cd = kzalloc(sizeof(struct xhci_cd), GFP_ATOMIC);
 370         if (!cd)
 371                 return -ENOMEM;
 372         INIT_LIST_HEAD(&cd->cancel_cmd_list);
 373
 374         cd->command = command;
 375         cd->cmd_trb = cmd_trb;
 376         list_add_tail(&cd->cancel_cmd_list, &xhci->cancel_cmd_list);
 377
 378         return 0;
 379 }
 380
 381 /*
 382  * Cancel the command which has issue.
 383  *
 384  * Some commands may hang due to waiting for acknowledgement from
 385  * usb device. It is outside of the xHC's ability to control and
 386  * will cause the command ring is blocked. When it occurs software
 387  * should intervene to recover the command ring.
 388  * See Section 4.6.1.1 and 4.6.1.2
 389  */
 390 int xhci_cancel_cmd(struct xhci_hcd *xhci, struct xhci_command *command,
 391                 union xhci_trb *cmd_trb)
 392 {
 393         int retval = 0;
 394         unsigned long flags;
 395
 396         spin_lock_irqsave(&xhci->lock, flags);
 397
 398         if (xhci->xhc_state & XHCI_STATE_DYING) {
 399                 xhci_warn(xhci, "Abort the command ring,"
 400                                 " but the xHCI is dead.\n");
 401                 retval = -ESHUTDOWN;
 402                 goto fail;
 403         }
 404
 405         /* queue the cmd desriptor to cancel_cmd_list */
 406         retval = xhci_queue_cd(xhci, command, cmd_trb);
 407         if (retval) {
 408                 xhci_warn(xhci, "Queuing command descriptor failed.\n");
 409                 goto fail;
 410         }
 411
 412         /* abort command ring */
 413         retval = xhci_abort_cmd_ring(xhci);
 414         if (retval) {
 415                 xhci_err(xhci, "Abort command ring failed\n");
 416                 if (unlikely(retval == -ESHUTDOWN)) {
 417                         spin_unlock_irqrestore(&xhci->lock, flags);
 418                         usb_hc_died(xhci_to_hcd(xhci)->primary_hcd);
 419                         xhci_dbg(xhci, "xHCI host controller is dead.\n");
 420                         return retval;
 421                 }
 422         }
 423
 424 fail:
 425         spin_unlock_irqrestore(&xhci->lock, flags);
 426         return retval;
 427 }
 428
 429 void xhci_ring_ep_doorbell(struct xhci_hcd *xhci,
 430                 unsigned int slot_id,
 431                 unsigned int ep_index,
 432                 unsigned int stream_id)
 433 {
 434         __le32 __iomem *db_addr = &xhci->dba->doorbell[slot_id];
 435         struct xhci_virt_ep *ep = &xhci->devs[slot_id]->eps[ep_index];
 436         unsigned int ep_state = ep->ep_state;
 437
 438         /* Don't ring the doorbell for this endpoint if there are pending
 439          * cancellations because we don't want to interrupt processing.
 440          * We don't want to restart any stream rings if there's a set dequeue
 441          * pointer command pending because the device can choose to start any
 442          * stream once the endpoint is on the HW schedule.
 443          * FIXME - check all the stream rings for pending cancellations.
 444          */
 445         if ((ep_state & EP_HALT_PENDING) || (ep_state & SET_DEQ_PENDING) ||
 446             (ep_state & EP_HALTED))
 447                 return;
 448         xhci_writel(xhci, DB_VALUE(ep_index, stream_id), db_addr);
 449         /* The CPU has better things to do at this point than wait for a
 450          * write-posting flush.  It'll get there soon enough.
 451          */
 452 }
 453
 454 /* Ring the doorbell for any rings with pending URBs */
 455 static void ring_doorbell_for_active_rings(struct xhci_hcd *xhci,
 456                 unsigned int slot_id,
 457                 unsigned int ep_index)
 458 {
 459         unsigned int stream_id;
 460         struct xhci_virt_ep *ep;
 461
 462         ep = &xhci->devs[slot_id]->eps[ep_index];
 463
 464         /* A ring has pending URBs if its TD list is not empty */
 465         if (!(ep->ep_state & EP_HAS_STREAMS)) {
 466                 if (ep->ring && !(list_empty(&ep->ring->td_list)))
 467                         xhci_ring_ep_doorbell(xhci, slot_id, ep_index, 0);
 468                 return;
 469         }
 470
 471         for (stream_id = 1; stream_id < ep->stream_info->num_streams;
 472                         stream_id++) {
 473                 struct xhci_stream_info *stream_info = ep->stream_info;
 474                 if (!list_empty(&stream_info->stream_rings[stream_id]->td_list))
 475                         xhci_ring_ep_doorbell(xhci, slot_id, ep_index,
 476                                                 stream_id);
 477         }
 478 }
 479
 480 /*
 481  * Find the segment that trb is in.  Start searching in start_seg.
 482  * If we must move past a segment that has a link TRB with a toggle cycle state
 483  * bit set, then we will toggle the value pointed at by cycle_state.
 484  */
 485 static struct xhci_segment *find_trb_seg(
 486                 struct xhci_segment *start_seg,
 487                 union xhci_trb  *trb, int *cycle_state)
 488 {
 489         struct xhci_segment *cur_seg = start_seg;
 490         struct xhci_generic_trb *generic_trb;
 491
 492         while (cur_seg->trbs > trb ||
 493                         &cur_seg->trbs[TRBS_PER_SEGMENT - 1] < trb) {
 494                 generic_trb = &cur_seg->trbs[TRBS_PER_SEGMENT - 1].generic;
 495                 if (generic_trb->field[3] & cpu_to_le32(LINK_TOGGLE))
 496                         *cycle_state ^= 0x1;
 497                 cur_seg = cur_seg->next;
 498                 if (cur_seg == start_seg)
 499                         /* Looped over the entire list.  Oops! */
 500                         return NULL;
 501         }
 502         return cur_seg;
 503 }
 504
 505
 506 static struct xhci_ring *xhci_triad_to_transfer_ring(struct xhci_hcd *xhci,
 507                 unsigned int slot_id, unsigned int ep_index,
 508                 unsigned int stream_id)
 509 {
 510         struct xhci_virt_ep *ep;
 511
 512         ep = &xhci->devs[slot_id]->eps[ep_index];
 513         /* Common case: no streams */
 514         if (!(ep->ep_state & EP_HAS_STREAMS))
 515                 return ep->ring;
 516
 517         if (stream_id == 0) {
 518                 xhci_warn(xhci,
 519                                 "WARN: Slot ID %u, ep index %u has streams, "
 520                                 "but URB has no stream ID.\n",
 521                                 slot_id, ep_index);
 522                 return NULL;
 523         }
 524
 525         if (stream_id < ep->stream_info->num_streams)
 526                 return ep->stream_info->stream_rings[stream_id];
 527
 528         xhci_warn(xhci,
 529                         "WARN: Slot ID %u, ep index %u has "
 530                         "stream IDs 1 to %u allocated, "
 531                         "but stream ID %u is requested.\n",
 532                         slot_id, ep_index,
 533                         ep->stream_info->num_streams - 1,
 534                         stream_id);
 535         return NULL;
 536 }
 537
 538 /* Get the right ring for the given URB.
 539  * If the endpoint supports streams, boundary check the URB's stream ID.
 540  * If the endpoint doesn't support streams, return the singular endpoint ring.
 541  */
 542 static struct xhci_ring *xhci_urb_to_transfer_ring(struct xhci_hcd *xhci,
 543                 struct urb *urb)
 544 {
 545         return xhci_triad_to_transfer_ring(xhci, urb->dev->slot_id,
 546                 xhci_get_endpoint_index(&urb->ep->desc), urb->stream_id);
 547 }
 548
 549 /*
 550  * Move the xHC's endpoint ring dequeue pointer past cur_td.
 551  * Record the new state of the xHC's endpoint ring dequeue segment,
 552  * dequeue pointer, and new consumer cycle state in state.
 553  * Update our internal representation of the ring's dequeue pointer.
 554  *
 555  * We do this in three jumps:
 556  *  - First we update our new ring state to be the same as when the xHC stopped.
 557  *  - Then we traverse the ring to find the segment that contains
 558  *    the last TRB in the TD.  We toggle the xHC's new cycle state when we pass
 559  *    any link TRBs with the toggle cycle bit set.
 560  *  - Finally we move the dequeue state one TRB further, toggling the cycle bit
 561  *    if we've moved it past a link TRB with the toggle cycle bit set.
 562  *
 563  * Some of the uses of xhci_generic_trb are grotty, but if they're done
 564  * with correct __le32 accesses they should work fine.  Only users of this are
 565  * in here.
 566  */
 567 void xhci_find_new_dequeue_state(struct xhci_hcd *xhci,
 568                 unsigned int slot_id, unsigned int ep_index,
 569                 unsigned int stream_id, struct xhci_td *cur_td,
 570                 struct xhci_dequeue_state *state)
 571 {
 572         struct xhci_virt_device *dev = xhci->devs[slot_id];
 573         struct xhci_virt_ep *ep = &dev->eps[ep_index];
 574         struct xhci_ring *ep_ring;
 575         struct xhci_segment *new_seg;
 576         union xhci_trb *new_deq;
 577         dma_addr_t addr;
 578         u64 hw_dequeue;
 579         bool cycle_found = false;
 580         bool td_last_trb_found = false;
 581
 582         ep_ring = xhci_triad_to_transfer_ring(xhci, slot_id,
 583                         ep_index, stream_id);
 584         if (!ep_ring) {
 585                 xhci_warn(xhci, "WARN can't find new dequeue state "
 586                                 "for invalid stream ID %u.\n",
 587                                 stream_id);
 588                 return;
 589         }
 590
 591         /* Dig out the cycle state saved by the xHC during the stop ep cmd */
 592         xhci_dbg(xhci, "Finding endpoint context\n");
 593         /* 4.6.9 the css flag is written to the stream context for streams */
 594         if (ep->ep_state & EP_HAS_STREAMS) {
 595                 struct xhci_stream_ctx *ctx =
 596                         &ep->stream_info->stream_ctx_array[stream_id];
 597                 hw_dequeue = le64_to_cpu(ctx->stream_ring);
 598         } else {
 599                 struct xhci_ep_ctx *ep_ctx
 600                         = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index);
 601                 hw_dequeue = le64_to_cpu(ep_ctx->deq);
 602         }
 603
 604         new_seg = ep_ring->deq_seg;
 605         new_deq = ep_ring->dequeue;
 606         state->new_cycle_state = hw_dequeue & 0x1;
 607
 608         /*
 609          * We want to find the pointer, segment and cycle state of the new trb
 610          * (the one after current TD's last_trb). We know the cycle state at
 611          * hw_dequeue, so walk the ring until both hw_dequeue and last_trb are
 612          * found.
 613          */
 614         do {
 615                 if (!cycle_found && xhci_trb_virt_to_dma(new_seg, new_deq)
 616                     == (dma_addr_t)(hw_dequeue & ~0xf)) {
 617                         cycle_found = true;
 618                         if (td_last_trb_found)
 619                                 break;
 620                 }
 621                 if (new_deq == cur_td->last_trb)
 622                         td_last_trb_found = true;
 623
 624                 if (cycle_found &&
 625                     TRB_TYPE_LINK_LE32(new_deq->generic.field[3]) &&
 626                     new_deq->generic.field[3] & cpu_to_le32(LINK_TOGGLE))
 627                         state->new_cycle_state ^= 0x1;
 628
 629                 next_trb(xhci, ep_ring, &new_seg, &new_deq);
 630
 631                 /* Search wrapped around, bail out */
 632                 if (new_deq == ep->ring->dequeue) {
 633                         xhci_err(xhci, "Error: Failed finding new dequeue state\n");
 634                         state->new_deq_seg = NULL;
 635                         state->new_deq_ptr = NULL;
 636                         return;
 637                 }
 638
 639         } while (!cycle_found || !td_last_trb_found);
 640
 641         state->new_deq_seg = new_seg;
 642         state->new_deq_ptr = new_deq;
 643
 644         /* Don't update the ring cycle state for the producer (us). */
 645         xhci_dbg(xhci, "Cycle state = 0x%x\n", state->new_cycle_state);
 646
 647         xhci_dbg(xhci, "New dequeue segment = %p (virtual)\n",
 648                         state->new_deq_seg);
 649         addr = xhci_trb_virt_to_dma(state->new_deq_seg, state->new_deq_ptr);
 650         xhci_dbg(xhci, "New dequeue pointer = 0x%llx (DMA)\n",
 651                         (unsigned long long) addr);
 652 }
 653
 654 /* flip_cycle means flip the cycle bit of all but the first and last TRB.
 655  * (The last TRB actually points to the ring enqueue pointer, which is not part
 656  * of this TD.)  This is used to remove partially enqueued isoc TDs from a ring.
 657  */
 658 static void td_to_noop(struct xhci_hcd *xhci, struct xhci_ring *ep_ring,
 659                 struct xhci_td *cur_td, bool flip_cycle)
 660 {
 661         struct xhci_segment *cur_seg;
 662         union xhci_trb *cur_trb;
 663
 664         for (cur_seg = cur_td->start_seg, cur_trb = cur_td->first_trb;
 665                         true;
 666                         next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) {
 667                 if (TRB_TYPE_LINK_LE32(cur_trb->generic.field[3])) {
 668                         /* Unchain any chained Link TRBs, but
 669                          * leave the pointers intact.
 670                          */
 671                         cur_trb->generic.field[3] &= cpu_to_le32(~TRB_CHAIN);
 672                         /* Flip the cycle bit (link TRBs can't be the first
 673                          * or last TRB).
 674                          */
 675                         if (flip_cycle)
 676                                 cur_trb->generic.field[3] ^=
 677                                         cpu_to_le32(TRB_CYCLE);
 678                         xhci_dbg(xhci, "Cancel (unchain) link TRB\n");
 679                         xhci_dbg(xhci, "Address = %p (0x%llx dma); "
 680                                         "in seg %p (0x%llx dma)\n",
 681                                         cur_trb,
 682                                         (unsigned long long)xhci_trb_virt_to_dma(cur_seg, cur_trb),
 683                                         cur_seg,
 684                                         (unsigned long long)cur_seg->dma);
 685                 } else {
 686                         cur_trb->generic.field[0] = 0;
 687                         cur_trb->generic.field[1] = 0;
 688                         cur_trb->generic.field[2] = 0;
 689                         /* Preserve only the cycle bit of this TRB */
 690                         cur_trb->generic.field[3] &= cpu_to_le32(TRB_CYCLE);
 691                         /* Flip the cycle bit except on the first or last TRB */
 692                         if (flip_cycle && cur_trb != cur_td->first_trb &&
 693                                         cur_trb != cur_td->last_trb)
 694                                 cur_trb->generic.field[3] ^=
 695                                         cpu_to_le32(TRB_CYCLE);
 696                         cur_trb->generic.field[3] |= cpu_to_le32(
 697                                 TRB_TYPE(TRB_TR_NOOP));
 698                         xhci_dbg(xhci, "Cancel TRB %p (0x%llx dma) "
 699                                         "in seg %p (0x%llx dma)\n",
 700                                         cur_trb,
 701                                         (unsigned long long)xhci_trb_virt_to_dma(cur_seg, cur_trb),
 702                                         cur_seg,
 703                                         (unsigned long long)cur_seg->dma);
 704                 }
 705                 if (cur_trb == cur_td->last_trb)
 706                         break;
 707         }
 708 }
 709
 710 static int queue_set_tr_deq(struct xhci_hcd *xhci, int slot_id,
 711                 unsigned int ep_index, unsigned int stream_id,
 712                 struct xhci_segment *deq_seg,
 713                 union xhci_trb *deq_ptr, u32 cycle_state);
 714
 715 void xhci_queue_new_dequeue_state(struct xhci_hcd *xhci,
 716                 unsigned int slot_id, unsigned int ep_index,
 717                 unsigned int stream_id,
 718                 struct xhci_dequeue_state *deq_state)
 719 {
 720         struct xhci_virt_ep *ep = &xhci->devs[slot_id]->eps[ep_index];
 721
 722         xhci_dbg(xhci, "Set TR Deq Ptr cmd, new deq seg = %p (0x%llx dma), "
 723                         "new deq ptr = %p (0x%llx dma), new cycle = %u\n",
 724                         deq_state->new_deq_seg,
 725                         (unsigned long long)deq_state->new_deq_seg->dma,
 726                         deq_state->new_deq_ptr,
 727                         (unsigned long long)xhci_trb_virt_to_dma(deq_state->new_deq_seg, deq_state->new_deq_ptr),
 728                         deq_state->new_cycle_state);
 729         queue_set_tr_deq(xhci, slot_id, ep_index, stream_id,
 730                         deq_state->new_deq_seg,
 731                         deq_state->new_deq_ptr,
 732                         (u32) deq_state->new_cycle_state);
 733         /* Stop the TD queueing code from ringing the doorbell until
 734          * this command completes.  The HC won't set the dequeue pointer
 735          * if the ring is running, and ringing the doorbell starts the
 736          * ring running.
 737          */
 738         ep->ep_state |= SET_DEQ_PENDING;
 739 }
 740
 741 static void xhci_stop_watchdog_timer_in_irq(struct xhci_hcd *xhci,
 742                 struct xhci_virt_ep *ep)
 743 {
 744         ep->ep_state &= ~EP_HALT_PENDING;
 745         /* Can't del_timer_sync in interrupt, so we attempt to cancel.  If the
 746          * timer is running on another CPU, we don't decrement stop_cmds_pending
 747          * (since we didn't successfully stop the watchdog timer).
 748          */
 749         if (del_timer(&ep->stop_cmd_timer))
 750                 ep->stop_cmds_pending--;
 751 }
 752
 753 /* Must be called with xhci->lock held in interrupt context */
 754 static void xhci_giveback_urb_in_irq(struct xhci_hcd *xhci,
 755                 struct xhci_td *cur_td, int status, char *adjective)
 756 {
 757         struct usb_hcd *hcd;
 758         struct urb      *urb;
 759         struct urb_priv *urb_priv;
 760
 761         urb = cur_td->urb;
 762         urb_priv = urb->hcpriv;
 763         urb_priv->td_cnt++;
 764         hcd = bus_to_hcd(urb->dev->bus);
 765
 766         /* Only giveback urb when this is the last td in urb */
 767         if (urb_priv->td_cnt == urb_priv->length) {
 768                 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
 769                         xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs--;
 770                         if (xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs == 0) {
 771                                 if (xhci->quirks & XHCI_AMD_PLL_FIX)
 772                                         usb_amd_quirk_pll_enable();
 773                         }
 774                 }
 775                 usb_hcd_unlink_urb_from_ep(hcd, urb);
 776
 777                 spin_unlock(&xhci->lock);
 778                 usb_hcd_giveback_urb(hcd, urb, status);
 779                 xhci_urb_free_priv(xhci, urb_priv);
 780                 spin_lock(&xhci->lock);
 781         }
 782 }
 783
 784 /*
 785  * When we get a command completion for a Stop Endpoint Command, we need to
 786  * unlink any cancelled TDs from the ring.  There are two ways to do that:
 787  *
 788  *  1. If the HW was in the middle of processing the TD that needs to be
 789  *     cancelled, then we must move the ring's dequeue pointer past the last TRB
 790  *     in the TD with a Set Dequeue Pointer Command.
 791  *  2. Otherwise, we turn all the TRBs in the TD into No-op TRBs (with the chain
 792  *     bit cleared) so that the HW will skip over them.
 793  */
 794 static void handle_stopped_endpoint(struct xhci_hcd *xhci,
 795                 union xhci_trb *trb, struct xhci_event_cmd *event)
 796 {
 797         unsigned int slot_id;
 798         unsigned int ep_index;
 799         struct xhci_virt_device *virt_dev;
 800         struct xhci_ring *ep_ring;
 801         struct xhci_virt_ep *ep;
 802         struct list_head *entry;
 803         struct xhci_td *cur_td = NULL;
 804         struct xhci_td *last_unlinked_td;
 805
 806         struct xhci_dequeue_state deq_state;
 807
 808         if (unlikely(TRB_TO_SUSPEND_PORT(
 809                              le32_to_cpu(xhci->cmd_ring->dequeue->generic.field[3])))) {
 810                 slot_id = TRB_TO_SLOT_ID(
 811                         le32_to_cpu(xhci->cmd_ring->dequeue->generic.field[3]));
 812                 virt_dev = xhci->devs[slot_id];
 813                 if (virt_dev)
 814                         handle_cmd_in_cmd_wait_list(xhci, virt_dev,
 815                                 event);
 816                 else
 817                         xhci_warn(xhci, "Stop endpoint command "
 818                                 "completion for disabled slot %u\n",
 819                                 slot_id);
 820                 return;
 821         }
 822
 823         memset(&deq_state, 0, sizeof(deq_state));
 824         slot_id = TRB_TO_SLOT_ID(le32_to_cpu(trb->generic.field[3]));
 825         ep_index = TRB_TO_EP_INDEX(le32_to_cpu(trb->generic.field[3]));
 826         ep = &xhci->devs[slot_id]->eps[ep_index];
 827
 828         if (list_empty(&ep->cancelled_td_list)) {
 829                 xhci_stop_watchdog_timer_in_irq(xhci, ep);
 830                 ep->stopped_td = NULL;
 831                 ring_doorbell_for_active_rings(xhci, slot_id, ep_index);
 832                 return;
 833         }
 834
 835         /* Fix up the ep ring first, so HW stops executing cancelled TDs.
 836          * We have the xHCI lock, so nothing can modify this list until we drop
 837          * it.  We're also in the event handler, so we can't get re-interrupted
 838          * if another Stop Endpoint command completes
 839          */
 840         list_for_each(entry, &ep->cancelled_td_list) {
 841                 cur_td = list_entry(entry, struct xhci_td, cancelled_td_list);
 842                 xhci_dbg(xhci, "Cancelling TD starting at %p, 0x%llx (dma).\n",
 843                                 cur_td->first_trb,
 844                                 (unsigned long long)xhci_trb_virt_to_dma(cur_td->start_seg, cur_td->first_trb));
 845                 ep_ring = xhci_urb_to_transfer_ring(xhci, cur_td->urb);
 846                 if (!ep_ring) {
 847                         /* This shouldn't happen unless a driver is mucking
 848                          * with the stream ID after submission.  This will
 849                          * leave the TD on the hardware ring, and the hardware
 850                          * will try to execute it, and may access a buffer
 851                          * that has already been freed.  In the best case, the
 852                          * hardware will execute it, and the event handler will
 853                          * ignore the completion event for that TD, since it was
 854                          * removed from the td_list for that endpoint.  In
 855                          * short, don't muck with the stream ID after
 856                          * submission.
 857                          */
 858                         xhci_warn(xhci, "WARN Cancelled URB %p "
 859                                         "has invalid stream ID %u.\n",
 860                                         cur_td->urb,
 861                                         cur_td->urb->stream_id);
 862                         goto remove_finished_td;
 863                 }
 864                 /*
 865                  * If we stopped on the TD we need to cancel, then we have to
 866                  * move the xHC endpoint ring dequeue pointer past this TD.
 867                  */
 868                 if (cur_td == ep->stopped_td)
 869                         xhci_find_new_dequeue_state(xhci, slot_id, ep_index,
 870                                         cur_td->urb->stream_id,
 871                                         cur_td, &deq_state);
 872                 else
 873                         td_to_noop(xhci, ep_ring, cur_td, false);
 874 remove_finished_td:
 875                 /*
 876                  * The event handler won't see a completion for this TD anymore,
 877                  * so remove it from the endpoint ring's TD list.  Keep it in
 878                  * the cancelled TD list for URB completion later.
 879                  */
 880                 list_del_init(&cur_td->td_list);
 881         }
 882         last_unlinked_td = cur_td;
 883         xhci_stop_watchdog_timer_in_irq(xhci, ep);
 884
 885         /* If necessary, queue a Set Transfer Ring Dequeue Pointer command */
 886         if (deq_state.new_deq_ptr && deq_state.new_deq_seg) {
 887                 xhci_queue_new_dequeue_state(xhci,
 888                                 slot_id, ep_index,
 889                                 ep->stopped_td->urb->stream_id,
 890                                 &deq_state);
 891                 xhci_ring_cmd_db(xhci);
 892         } else {
 893                 /* Otherwise ring the doorbell(s) to restart queued transfers */
 894                 ring_doorbell_for_active_rings(xhci, slot_id, ep_index);
 895         }
 896
 897         /* Clear stopped_td if endpoint is not halted */
 898         if (!(ep->ep_state & EP_HALTED))
 899                 ep->stopped_td = NULL;
 900
 901         /*
 902          * Drop the lock and complete the URBs in the cancelled TD list.
 903          * New TDs to be cancelled might be added to the end of the list before
 904          * we can complete all the URBs for the TDs we already unlinked.
 905          * So stop when we've completed the URB for the last TD we unlinked.
 906          */
 907         do {
 908                 cur_td = list_entry(ep->cancelled_td_list.next,
 909                                 struct xhci_td, cancelled_td_list);
 910                 list_del_init(&cur_td->cancelled_td_list);
 911
 912                 /* Clean up the cancelled URB */
 913                 /* Doesn't matter what we pass for status, since the core will
 914                  * just overwrite it (because the URB has been unlinked).
 915                  */
 916                 xhci_giveback_urb_in_irq(xhci, cur_td, 0, "cancelled");
 917
 918                 /* Stop processing the cancelled list if the watchdog timer is
 919                  * running.
 920                  */
 921                 if (xhci->xhc_state & XHCI_STATE_DYING)
 922                         return;
 923         } while (cur_td != last_unlinked_td);
 924
 925         /* Return to the event handler with xhci->lock re-acquired */
 926 }
 927
 928 /* Watchdog timer function for when a stop endpoint command fails to complete.
 929  * In this case, we assume the host controller is broken or dying or dead.  The
 930  * host may still be completing some other events, so we have to be careful to
 931  * let the event ring handler and the URB dequeueing/enqueueing functions know
 932  * through xhci->state.
 933  *
 934  * The timer may also fire if the host takes a very long time to respond to the
 935  * command, and the stop endpoint command completion handler cannot delete the
 936  * timer before the timer function is called.  Another endpoint cancellation may
 937  * sneak in before the timer function can grab the lock, and that may queue
 938  * another stop endpoint command and add the timer back.  So we cannot use a
 939  * simple flag to say whether there is a pending stop endpoint command for a
 940  * particular endpoint.
 941  *
 942  * Instead we use a combination of that flag and a counter for the number of
 943  * pending stop endpoint commands.  If the timer is the tail end of the last
 944  * stop endpoint command, and the endpoint's command is still pending, we assume
 945  * the host is dying.
 946  */
 947 void xhci_stop_endpoint_command_watchdog(unsigned long arg)
 948 {
 949         struct xhci_hcd *xhci;
 950         struct xhci_virt_ep *ep;
 951         struct xhci_virt_ep *temp_ep;
 952         struct xhci_ring *ring;
 953         struct xhci_td *cur_td;
 954         int ret, i, j;
 955         unsigned long flags;
 956
 957         ep = (struct xhci_virt_ep *) arg;
 958         xhci = ep->xhci;
 959
 960         spin_lock_irqsave(&xhci->lock, flags);
 961
 962         ep->stop_cmds_pending--;
 963         if (xhci->xhc_state & XHCI_STATE_DYING) {
 964                 xhci_dbg(xhci, "Stop EP timer ran, but another timer marked "
 965                                 "xHCI as DYING, exiting.\n");
 966                 spin_unlock_irqrestore(&xhci->lock, flags);
 967                 return;
 968         }
 969         if (!(ep->stop_cmds_pending == 0 && (ep->ep_state & EP_HALT_PENDING))) {
 970                 xhci_dbg(xhci, "Stop EP timer ran, but no command pending, "
 971                                 "exiting.\n");
 972                 spin_unlock_irqrestore(&xhci->lock, flags);
 973                 return;
 974         }
 975
 976         xhci_warn(xhci, "xHCI host not responding to stop endpoint command.\n");
 977         xhci_warn(xhci, "Assuming host is dying, halting host.\n");
 978         /* Oops, HC is dead or dying or at least not responding to the stop
 979          * endpoint command.
 980          */
 981         xhci->xhc_state |= XHCI_STATE_DYING;
 982         /* Disable interrupts from the host controller and start halting it */
 983         xhci_quiesce(xhci);
 984         spin_unlock_irqrestore(&xhci->lock, flags);
 985
 986         ret = xhci_halt(xhci);
 987
 988         spin_lock_irqsave(&xhci->lock, flags);
 989         if (ret < 0) {
 990                 /* This is bad; the host is not responding to commands and it's
 991                  * not allowing itself to be halted.  At least interrupts are
 992                  * disabled. If we call usb_hc_died(), it will attempt to
 993                  * disconnect all device drivers under this host.  Those
 994                  * disconnect() methods will wait for all URBs to be unlinked,
 995                  * so we must complete them.
 996                  */
 997                 xhci_warn(xhci, "Non-responsive xHCI host is not halting.\n");
 998                 xhci_warn(xhci, "Completing active URBs anyway.\n");
 999                 /* We could turn all TDs on the rings to no-ops.  This won't
1000                  * help if the host has cached part of the ring, and is slow if
1001                  * we want to preserve the cycle bit.  Skip it and hope the host
1002                  * doesn't touch the memory.
1003                  */
1004         }
1005         for (i = 0; i < MAX_HC_SLOTS; i++) {
1006                 if (!xhci->devs[i])
1007                         continue;
1008                 for (j = 0; j < 31; j++) {
1009                         temp_ep = &xhci->devs[i]->eps[j];
1010                         ring = temp_ep->ring;
1011                         if (!ring)
1012                                 continue;
1013                         xhci_dbg(xhci, "Killing URBs for slot ID %u, "
1014                                         "ep index %u\n", i, j);
1015                         while (!list_empty(&ring->td_list)) {
1016                                 cur_td = list_first_entry(&ring->td_list,
1017                                                 struct xhci_td,
1018                                                 td_list);
1019                                 list_del_init(&cur_td->td_list);
1020                                 if (!list_empty(&cur_td->cancelled_td_list))
1021                                         list_del_init(&cur_td->cancelled_td_list);
1022                                 xhci_giveback_urb_in_irq(xhci, cur_td,
1023                                                 -ESHUTDOWN, "killed");
1024                         }
1025                         while (!list_empty(&temp_ep->cancelled_td_list)) {
1026                                 cur_td = list_first_entry(
1027                                                 &temp_ep->cancelled_td_list,
1028                                                 struct xhci_td,
1029                                                 cancelled_td_list);
1030                                 list_del_init(&cur_td->cancelled_td_list);
1031                                 xhci_giveback_urb_in_irq(xhci, cur_td,
1032                                                 -ESHUTDOWN, "killed");
1033                         }
1034                 }
1035         }
1036         spin_unlock_irqrestore(&xhci->lock, flags);
1037         xhci_dbg(xhci, "Calling usb_hc_died()\n");
1038         usb_hc_died(xhci_to_hcd(xhci)->primary_hcd);
1039         xhci_dbg(xhci, "xHCI host controller is dead.\n");
1040 }
1041
1042 /*
1043  * When we get a completion for a Set Transfer Ring Dequeue Pointer command,
1044  * we need to clear the set deq pending flag in the endpoint ring state, so that
1045  * the TD queueing code can ring the doorbell again.  We also need to ring the
1046  * endpoint doorbell to restart the ring, but only if there aren't more
1047  * cancellations pending.
1048  */
1049 static void handle_set_deq_completion(struct xhci_hcd *xhci,
1050                 struct xhci_event_cmd *event,
1051                 union xhci_trb *trb)
1052 {
1053         unsigned int slot_id;
1054         unsigned int ep_index;
1055         unsigned int stream_id;
1056         struct xhci_ring *ep_ring;
1057         struct xhci_virt_device *dev;
1058         struct xhci_ep_ctx *ep_ctx;
1059         struct xhci_slot_ctx *slot_ctx;
1060
1061         slot_id = TRB_TO_SLOT_ID(le32_to_cpu(trb->generic.field[3]));
1062         ep_index = TRB_TO_EP_INDEX(le32_to_cpu(trb->generic.field[3]));
1063         stream_id = TRB_TO_STREAM_ID(le32_to_cpu(trb->generic.field[2]));
1064         dev = xhci->devs[slot_id];
1065
1066         ep_ring = xhci_stream_id_to_ring(dev, ep_index, stream_id);
1067         if (!ep_ring) {
1068                 xhci_warn(xhci, "WARN Set TR deq ptr command for "
1069                                 "freed stream ID %u\n",
1070                                 stream_id);
1071                 /* XXX: Harmless??? */
1072                 dev->eps[ep_index].ep_state &= ~SET_DEQ_PENDING;
1073                 return;
1074         }
1075
1076         ep_ctx = xhci_get_ep_ctx(xhci, dev->out_ctx, ep_index);
1077         slot_ctx = xhci_get_slot_ctx(xhci, dev->out_ctx);
1078
1079         if (GET_COMP_CODE(le32_to_cpu(event->status)) != COMP_SUCCESS) {
1080                 unsigned int ep_state;
1081                 unsigned int slot_state;
1082
1083                 switch (GET_COMP_CODE(le32_to_cpu(event->status))) {
1084                 case COMP_TRB_ERR:
1085                         xhci_warn(xhci, "WARN Set TR Deq Ptr cmd invalid because "
1086                                         "of stream ID configuration\n");
1087                         break;
1088                 case COMP_CTX_STATE:
1089                         xhci_warn(xhci, "WARN Set TR Deq Ptr cmd failed due "
1090                                         "to incorrect slot or ep state.\n");
1091                         ep_state = le32_to_cpu(ep_ctx->ep_info);
1092                         ep_state &= EP_STATE_MASK;
1093                         slot_state = le32_to_cpu(slot_ctx->dev_state);
1094                         slot_state = GET_SLOT_STATE(slot_state);
1095                         xhci_dbg(xhci, "Slot state = %u, EP state = %u\n",
1096                                         slot_state, ep_state);
1097                         break;
1098                 case COMP_EBADSLT:
1099                         xhci_warn(xhci, "WARN Set TR Deq Ptr cmd failed because "
1100                                         "slot %u was not enabled.\n", slot_id);
1101                         break;
1102                 default:
1103                         xhci_warn(xhci, "WARN Set TR Deq Ptr cmd with unknown "
1104                                         "completion code of %u.\n",
1105                                   GET_COMP_CODE(le32_to_cpu(event->status)));
1106                         break;
1107                 }
1108                 /* OK what do we do now?  The endpoint state is hosed, and we
1109                  * should never get to this point if the synchronization between
1110                  * queueing, and endpoint state are correct.  This might happen
1111                  * if the device gets disconnected after we've finished
1112                  * cancelling URBs, which might not be an error...
1113                  */
1114         } else {
1115                 xhci_dbg(xhci, "Successful Set TR Deq Ptr cmd, deq = @%08llx\n",
1116                          le64_to_cpu(ep_ctx->deq));
1117                 if (xhci_trb_virt_to_dma(dev->eps[ep_index].queued_deq_seg,
1118                                          dev->eps[ep_index].queued_deq_ptr) ==
1119                     (le64_to_cpu(ep_ctx->deq) & ~(EP_CTX_CYCLE_MASK))) {
1120                         /* Update the ring's dequeue segment and dequeue pointer
1121                          * to reflect the new position.
1122                          */
1123                         ep_ring->deq_seg = dev->eps[ep_index].queued_deq_seg;
1124                         ep_ring->dequeue = dev->eps[ep_index].queued_deq_ptr;
1125                 } else {
1126                         xhci_warn(xhci, "Mismatch between completed Set TR Deq "
1127                                         "Ptr command & xHCI internal state.\n");
1128                         xhci_warn(xhci, "ep deq seg = %p, deq ptr = %p\n",
1129                                         dev->eps[ep_index].queued_deq_seg,
1130                                         dev->eps[ep_index].queued_deq_ptr);
1131                 }
1132         }
1133
1134         dev->eps[ep_index].ep_state &= ~SET_DEQ_PENDING;
1135         dev->eps[ep_index].queued_deq_seg = NULL;
1136         dev->eps[ep_index].queued_deq_ptr = NULL;
1137         /* Restart any rings with pending URBs */
1138         ring_doorbell_for_active_rings(xhci, slot_id, ep_index);
1139 }
1140
1141 static void handle_reset_ep_completion(struct xhci_hcd *xhci,
1142                 struct xhci_event_cmd *event,
1143                 union xhci_trb *trb)
1144 {
1145         int slot_id;
1146         unsigned int ep_index;
1147
1148         slot_id = TRB_TO_SLOT_ID(le32_to_cpu(trb->generic.field[3]));
1149         ep_index = TRB_TO_EP_INDEX(le32_to_cpu(trb->generic.field[3]));
1150         /* This command will only fail if the endpoint wasn't halted,
1151          * but we don't care.
1152          */
1153         xhci_dbg(xhci, "Ignoring reset ep completion code of %u\n",
1154                  GET_COMP_CODE(le32_to_cpu(event->status)));
1155
1156         /* HW with the reset endpoint quirk needs to have a configure endpoint
1157          * command complete before the endpoint can be used.  Queue that here
1158          * because the HW can't handle two commands being queued in a row.
1159          */
1160         if (xhci->quirks & XHCI_RESET_EP_QUIRK) {
1161                 xhci_dbg(xhci, "Queueing configure endpoint command\n");
1162                 xhci_queue_configure_endpoint(xhci,
1163                                 xhci->devs[slot_id]->in_ctx->dma, slot_id,
1164                                 false);
1165                 xhci_ring_cmd_db(xhci);
1166         } else {
1167                 /* Clear our internal halted state */
1168                 xhci->devs[slot_id]->eps[ep_index].ep_state &= ~EP_HALTED;
1169         }
1170 }
1171
1172 /* Complete the command and detele it from the devcie's command queue.
1173  */
1174 static void xhci_complete_cmd_in_cmd_wait_list(struct xhci_hcd *xhci,
1175                 struct xhci_command *command, u32 status)
1176 {
1177         command->status = status;
1178         list_del(&command->cmd_list);
1179         if (command->completion)
1180                 complete(command->completion);
1181         else
1182                 xhci_free_command(xhci, command);
1183 }
1184
1185
1186 /* Check to see if a command in the device's command queue matches this one.
1187  * Signal the completion or free the command, and return 1.  Return 0 if the
1188  * completed command isn't at the head of the command list.
1189  */
1190 static int handle_cmd_in_cmd_wait_list(struct xhci_hcd *xhci,
1191                 struct xhci_virt_device *virt_dev,
1192                 struct xhci_event_cmd *event)
1193 {
1194         struct xhci_command *command;
1195
1196         if (list_empty(&virt_dev->cmd_list))
1197                 return 0;
1198
1199         command = list_entry(virt_dev->cmd_list.next,
1200                         struct xhci_command, cmd_list);
1201         if (xhci->cmd_ring->dequeue != command->command_trb)
1202                 return 0;
1203
1204         xhci_complete_cmd_in_cmd_wait_list(xhci, command,
1205                         GET_COMP_CODE(le32_to_cpu(event->status)));
1206         return 1;
1207 }
1208
1209 /*
1210  * Finding the command trb need to be cancelled and modifying it to
1211  * NO OP command. And if the command is in device's command wait
1212  * list, finishing and freeing it.
1213  *
1214  * If we can't find the command trb, we think it had already been
1215  * executed.
1216  */
1217 static void xhci_cmd_to_noop(struct xhci_hcd *xhci, struct xhci_cd *cur_cd)
1218 {
1219         struct xhci_segment *cur_seg;
1220         union xhci_trb *cmd_trb;
1221         u32 cycle_state;
1222
1223         if (xhci->cmd_ring->dequeue == xhci->cmd_ring->enqueue)
1224                 return;
1225
1226         /* find the current segment of command ring */
1227         cur_seg = find_trb_seg(xhci->cmd_ring->first_seg,
1228                         xhci->cmd_ring->dequeue, &cycle_state);
1229
1230         if (!cur_seg) {
1231                 xhci_warn(xhci, "Command ring mismatch, dequeue = %p %llx (dma)\n",
1232                                 xhci->cmd_ring->dequeue,
1233                                 (unsigned long long)
1234                                 xhci_trb_virt_to_dma(xhci->cmd_ring->deq_seg,
1235                                         xhci->cmd_ring->dequeue));
1236                 xhci_debug_ring(xhci, xhci->cmd_ring);
1237                 xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
1238                 return;
1239         }
1240
1241         /* find the command trb matched by cd from command ring */
1242         for (cmd_trb = xhci->cmd_ring->dequeue;
1243                         cmd_trb != xhci->cmd_ring->enqueue;
1244                         next_trb(xhci, xhci->cmd_ring, &cur_seg, &cmd_trb)) {
1245                 /* If the trb is link trb, continue */
1246                 if (TRB_TYPE_LINK_LE32(cmd_trb->generic.field[3]))
1247                         continue;
1248
1249                 if (cur_cd->cmd_trb == cmd_trb) {
1250
1251                         /* If the command in device's command list, we should
1252                          * finish it and free the command structure.
1253                          */
1254                         if (cur_cd->command)
1255                                 xhci_complete_cmd_in_cmd_wait_list(xhci,
1256                                         cur_cd->command, COMP_CMD_STOP);
1257
1258                         /* get cycle state from the origin command trb */
1259                         cycle_state = le32_to_cpu(cmd_trb->generic.field[3])
1260                                 & TRB_CYCLE;
1261
1262                         /* modify the command trb to NO OP command */
1263                         cmd_trb->generic.field[0] = 0;
1264                         cmd_trb->generic.field[1] = 0;
1265                         cmd_trb->generic.field[2] = 0;
1266                         cmd_trb->generic.field[3] = cpu_to_le32(
1267                                         TRB_TYPE(TRB_CMD_NOOP) | cycle_state);
1268                         break;
1269                 }
1270         }
1271 }
1272
1273 static void xhci_cancel_cmd_in_cd_list(struct xhci_hcd *xhci)
1274 {
1275         struct xhci_cd *cur_cd, *next_cd;
1276
1277         if (list_empty(&xhci->cancel_cmd_list))
1278                 return;
1279
1280         list_for_each_entry_safe(cur_cd, next_cd,
1281                         &xhci->cancel_cmd_list, cancel_cmd_list) {
1282                 xhci_cmd_to_noop(xhci, cur_cd);
1283                 list_del(&cur_cd->cancel_cmd_list);
1284                 kfree(cur_cd);
1285         }
1286 }
1287
1288 /*
1289  * traversing the cancel_cmd_list. If the command descriptor according
1290  * to cmd_trb is found, the function free it and return 1, otherwise
1291  * return 0.
1292  */
1293 static int xhci_search_cmd_trb_in_cd_list(struct xhci_hcd *xhci,
1294                 union xhci_trb *cmd_trb)
1295 {
1296         struct xhci_cd *cur_cd, *next_cd;
1297
1298         if (list_empty(&xhci->cancel_cmd_list))
1299                 return 0;
1300
1301         list_for_each_entry_safe(cur_cd, next_cd,
1302                         &xhci->cancel_cmd_list, cancel_cmd_list) {
1303                 if (cur_cd->cmd_trb == cmd_trb) {
1304                         if (cur_cd->command)
1305                                 xhci_complete_cmd_in_cmd_wait_list(xhci,
1306                                         cur_cd->command, COMP_CMD_STOP);
1307                         list_del(&cur_cd->cancel_cmd_list);
1308                         kfree(cur_cd);
1309                         return 1;
1310                 }
1311         }
1312
1313         return 0;
1314 }
1315
1316 /*
1317  * If the cmd_trb_comp_code is COMP_CMD_ABORT, we just check whether the
1318  * trb pointed by the command ring dequeue pointer is the trb we want to
1319  * cancel or not. And if the cmd_trb_comp_code is COMP_CMD_STOP, we will
1320  * traverse the cancel_cmd_list to trun the all of the commands according
1321  * to command descriptor to NO-OP trb.
1322  */
1323 static int handle_stopped_cmd_ring(struct xhci_hcd *xhci,
1324                 int cmd_trb_comp_code)
1325 {
1326         int cur_trb_is_good = 0;
1327
1328         /* Searching the cmd trb pointed by the command ring dequeue
1329          * pointer in command descriptor list. If it is found, free it.
1330          */
1331         cur_trb_is_good = xhci_search_cmd_trb_in_cd_list(xhci,
1332                         xhci->cmd_ring->dequeue);
1333
1334         if (cmd_trb_comp_code == COMP_CMD_ABORT)
1335                 xhci->cmd_ring_state = CMD_RING_STATE_STOPPED;
1336         else if (cmd_trb_comp_code == COMP_CMD_STOP) {
1337                 /* traversing the cancel_cmd_list and canceling
1338                  * the command according to command descriptor
1339                  */
1340                 xhci_cancel_cmd_in_cd_list(xhci);
1341
1342                 xhci->cmd_ring_state = CMD_RING_STATE_RUNNING;
1343                 /*
1344                  * ring command ring doorbell again to restart the
1345                  * command ring
1346                  */
1347                 if (xhci->cmd_ring->dequeue != xhci->cmd_ring->enqueue)
1348                         xhci_ring_cmd_db(xhci);
1349         }
1350         return cur_trb_is_good;
1351 }
1352
1353 static void handle_cmd_completion(struct xhci_hcd *xhci,
1354                 struct xhci_event_cmd *event)
1355 {
1356         int slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags));
1357         u64 cmd_dma;
1358         dma_addr_t cmd_dequeue_dma;
1359         struct xhci_input_control_ctx *ctrl_ctx;
1360         struct xhci_virt_device *virt_dev;
1361         unsigned int ep_index;
1362         struct xhci_ring *ep_ring;
1363         unsigned int ep_state;
1364
1365         cmd_dma = le64_to_cpu(event->cmd_trb);
1366         cmd_dequeue_dma = xhci_trb_virt_to_dma(xhci->cmd_ring->deq_seg,
1367                         xhci->cmd_ring->dequeue);
1368         /* Is the command ring deq ptr out of sync with the deq seg ptr? */
1369         if (cmd_dequeue_dma == 0) {
1370                 xhci->error_bitmask |= 1 << 4;
1371                 return;
1372         }
1373         /* Does the DMA address match our internal dequeue pointer address? */
1374         if (cmd_dma != (u64) cmd_dequeue_dma) {
1375                 xhci->error_bitmask |= 1 << 5;
1376                 return;
1377         }
1378
1379         if ((GET_COMP_CODE(le32_to_cpu(event->status)) == COMP_CMD_ABORT) ||
1380                 (GET_COMP_CODE(le32_to_cpu(event->status)) == COMP_CMD_STOP)) {
1381                 /* If the return value is 0, we think the trb pointed by
1382                  * command ring dequeue pointer is a good trb. The good
1383                  * trb means we don't want to cancel the trb, but it have
1384                  * been stopped by host. So we should handle it normally.
1385                  * Otherwise, driver should invoke inc_deq() and return.
1386                  */
1387                 if (handle_stopped_cmd_ring(xhci,
1388                                 GET_COMP_CODE(le32_to_cpu(event->status)))) {
1389                         inc_deq(xhci, xhci->cmd_ring, false);
1390                         return;
1391                 }
1392         }
1393
1394         switch (le32_to_cpu(xhci->cmd_ring->dequeue->generic.field[3])
1395                 & TRB_TYPE_BITMASK) {
1396         case TRB_TYPE(TRB_ENABLE_SLOT):
1397                 if (GET_COMP_CODE(le32_to_cpu(event->status)) == COMP_SUCCESS)
1398                         xhci->slot_id = slot_id;
1399                 else
1400                         xhci->slot_id = 0;
1401                 complete(&xhci->addr_dev);
1402                 break;
1403         case TRB_TYPE(TRB_DISABLE_SLOT):
1404                 if (xhci->devs[slot_id]) {
1405                         if (xhci->quirks & XHCI_EP_LIMIT_QUIRK)
1406                                 /* Delete default control endpoint resources */
1407                                 xhci_free_device_endpoint_resources(xhci,
1408                                                 xhci->devs[slot_id], true);
1409                         xhci_free_virt_device(xhci, slot_id);
1410                 }
1411                 break;
1412         case TRB_TYPE(TRB_CONFIG_EP):
1413                 virt_dev = xhci->devs[slot_id];
1414                 if (handle_cmd_in_cmd_wait_list(xhci, virt_dev, event))
1415                         break;
1416                 /*
1417                  * Configure endpoint commands can come from the USB core
1418                  * configuration or alt setting changes, or because the HW
1419                  * needed an extra configure endpoint command after a reset
1420                  * endpoint command or streams were being configured.
1421                  * If the command was for a halted endpoint, the xHCI driver
1422                  * is not waiting on the configure endpoint command.
1423                  */
1424                 ctrl_ctx = xhci_get_input_control_ctx(xhci,
1425                                 virt_dev->in_ctx);
1426                 /* Input ctx add_flags are the endpoint index plus one */
1427                 ep_index = xhci_last_valid_endpoint(le32_to_cpu(ctrl_ctx->add_flags)) - 1;
1428                 /* A usb_set_interface() call directly after clearing a halted
1429                  * condition may race on this quirky hardware.  Not worth
1430                  * worrying about, since this is prototype hardware.  Not sure
1431                  * if this will work for streams, but streams support was
1432                  * untested on this prototype.
1433                  */
1434                 if (xhci->quirks & XHCI_RESET_EP_QUIRK &&
1435                                 ep_index != (unsigned int) -1 &&
1436                     le32_to_cpu(ctrl_ctx->add_flags) - SLOT_FLAG ==
1437                     le32_to_cpu(ctrl_ctx->drop_flags)) {
1438                         ep_ring = xhci->devs[slot_id]->eps[ep_index].ring;
1439                         ep_state = xhci->devs[slot_id]->eps[ep_index].ep_state;
1440                         if (!(ep_state & EP_HALTED))
1441                                 goto bandwidth_change;
1442                         xhci_dbg(xhci, "Completed config ep cmd - "
1443                                         "last ep index = %d, state = %d\n",
1444                                         ep_index, ep_state);
1445                         /* Clear internal halted state and restart ring(s) */
1446                         xhci->devs[slot_id]->eps[ep_index].ep_state &=
1447                                 ~EP_HALTED;
1448                         ring_doorbell_for_active_rings(xhci, slot_id, ep_index);
1449                         break;
1450                 }
1451 bandwidth_change:
1452                 xhci_dbg(xhci, "Completed config ep cmd\n");
1453                 xhci->devs[slot_id]->cmd_status =
1454                         GET_COMP_CODE(le32_to_cpu(event->status));
1455                 complete(&xhci->devs[slot_id]->cmd_completion);
1456                 break;
1457         case TRB_TYPE(TRB_EVAL_CONTEXT):
1458                 virt_dev = xhci->devs[slot_id];
1459                 if (handle_cmd_in_cmd_wait_list(xhci, virt_dev, event))
1460                         break;
1461                 xhci->devs[slot_id]->cmd_status = GET_COMP_CODE(le32_to_cpu(event->status));
1462                 complete(&xhci->devs[slot_id]->cmd_completion);
1463                 break;
1464         case TRB_TYPE(TRB_ADDR_DEV):
1465                 xhci->devs[slot_id]->cmd_status = GET_COMP_CODE(le32_to_cpu(event->status));
1466                 complete(&xhci->addr_dev);
1467                 break;
1468         case TRB_TYPE(TRB_STOP_RING):
1469                 handle_stopped_endpoint(xhci, xhci->cmd_ring->dequeue, event);
1470                 break;
1471         case TRB_TYPE(TRB_SET_DEQ):
1472                 handle_set_deq_completion(xhci, event, xhci->cmd_ring->dequeue);
1473                 break;
1474         case TRB_TYPE(TRB_CMD_NOOP):
1475                 break;
1476         case TRB_TYPE(TRB_RESET_EP):
1477                 handle_reset_ep_completion(xhci, event, xhci->cmd_ring->dequeue);
1478                 break;
1479         case TRB_TYPE(TRB_RESET_DEV):
1480                 xhci_dbg(xhci, "Completed reset device command.\n");
1481                 slot_id = TRB_TO_SLOT_ID(
1482                         le32_to_cpu(xhci->cmd_ring->dequeue->generic.field[3]));
1483                 virt_dev = xhci->devs[slot_id];
1484                 if (virt_dev)
1485                         handle_cmd_in_cmd_wait_list(xhci, virt_dev, event);
1486                 else
1487                         xhci_warn(xhci, "Reset device command completion "
1488                                         "for disabled slot %u\n", slot_id);
1489                 break;
1490         case TRB_TYPE(TRB_NEC_GET_FW):
1491                 if (!(xhci->quirks & XHCI_NEC_HOST)) {
1492                         xhci->error_bitmask |= 1 << 6;
1493                         break;
1494                 }
1495                 xhci_dbg(xhci, "NEC firmware version %2x.%02x\n",
1496                          NEC_FW_MAJOR(le32_to_cpu(event->status)),
1497                          NEC_FW_MINOR(le32_to_cpu(event->status)));
1498                 break;
1499         default:
1500                 /* Skip over unknown commands on the event ring */
1501                 xhci->error_bitmask |= 1 << 6;
1502                 break;
1503         }
1504         inc_deq(xhci, xhci->cmd_ring, false);
1505 }
1506
1507 static void handle_vendor_event(struct xhci_hcd *xhci,
1508                 union xhci_trb *event)
1509 {
1510         u32 trb_type;
1511
1512         trb_type = TRB_FIELD_TO_TYPE(le32_to_cpu(event->generic.field[3]));
1513         xhci_dbg(xhci, "Vendor specific event TRB type = %u\n", trb_type);
1514         if (trb_type == TRB_NEC_CMD_COMP && (xhci->quirks & XHCI_NEC_HOST))
1515                 handle_cmd_completion(xhci, &event->event_cmd);
1516 }
1517
1518 /* @port_id: the one-based port ID from the hardware (indexed from array of all
1519  * port registers -- USB 3.0 and USB 2.0).
1520  *
1521  * Returns a zero-based port number, which is suitable for indexing into each of
1522  * the split roothubs' port arrays and bus state arrays.
1523  * Add one to it in order to call xhci_find_slot_id_by_port.
1524  */
1525 static unsigned int find_faked_portnum_from_hw_portnum(struct usb_hcd *hcd,
1526                 struct xhci_hcd *xhci, u32 port_id)
1527 {
1528         unsigned int i;
1529         unsigned int num_similar_speed_ports = 0;
1530
1531         /* port_id from the hardware is 1-based, but port_array[], usb3_ports[],
1532          * and usb2_ports are 0-based indexes.  Count the number of similar
1533          * speed ports, up to 1 port before this port.
1534          */
1535         for (i = 0; i < (port_id - 1); i++) {
1536                 u8 port_speed = xhci->port_array[i];
1537
1538                 /*
1539                  * Skip ports that don't have known speeds, or have duplicate
1540                  * Extended Capabilities port speed entries.
1541                  */
1542                 if (port_speed == 0 || port_speed == DUPLICATE_ENTRY)
1543                         continue;
1544
1545                 /*
1546                  * USB 3.0 ports are always under a USB 3.0 hub.  USB 2.0 and
1547                  * 1.1 ports are under the USB 2.0 hub.  If the port speed
1548                  * matches the device speed, it's a similar speed port.
1549                  */
1550                 if ((port_speed == 0x03) == (hcd->speed == HCD_USB3))
1551                         num_similar_speed_ports++;
1552         }
1553         return num_similar_speed_ports;
1554 }
1555
1556 static void handle_port_status(struct xhci_hcd *xhci,
1557                 union xhci_trb *event)
1558 {
1559         struct usb_hcd *hcd;
1560         u32 port_id;
1561         u32 temp, temp1;
1562         int max_ports;
1563         int slot_id;
1564         unsigned int faked_port_index;
1565         u8 major_revision;
1566         struct xhci_bus_state *bus_state;
1567         __le32 __iomem **port_array;
1568         bool bogus_port_status = false;
1569
1570         /* Port status change events always have a successful completion code */
1571         if (GET_COMP_CODE(le32_to_cpu(event->generic.field[2])) != COMP_SUCCESS) {
1572                 xhci_warn(xhci, "WARN: xHC returned failed port status event\n");
1573                 xhci->error_bitmask |= 1 << 8;
1574         }
1575         port_id = GET_PORT_ID(le32_to_cpu(event->generic.field[0]));
1576         xhci_dbg(xhci, "Port Status Change Event for port %d\n", port_id);
1577
1578         max_ports = HCS_MAX_PORTS(xhci->hcs_params1);
1579         if ((port_id <= 0) || (port_id > max_ports)) {
1580                 xhci_warn(xhci, "Invalid port id %d\n", port_id);
1581                 bogus_port_status = true;
1582                 goto cleanup;
1583         }
1584
1585         /* Figure out which usb_hcd this port is attached to:
1586          * is it a USB 3.0 port or a USB 2.0/1.1 port?
1587          */
1588         major_revision = xhci->port_array[port_id - 1];
1589         if (major_revision == 0) {
1590                 xhci_warn(xhci, "Event for port %u not in "
1591                                 "Extended Capabilities, ignoring.\n",
1592                                 port_id);
1593                 bogus_port_status = true;
1594                 goto cleanup;
1595         }
1596         if (major_revision == DUPLICATE_ENTRY) {
1597                 xhci_warn(xhci, "Event for port %u duplicated in"
1598                                 "Extended Capabilities, ignoring.\n",
1599                                 port_id);
1600                 bogus_port_status = true;
1601                 goto cleanup;
1602         }
1603
1604         /*
1605          * Hardware port IDs reported by a Port Status Change Event include USB
1606          * 3.0 and USB 2.0 ports.  We want to check if the port has reported a
1607          * resume event, but we first need to translate the hardware port ID
1608          * into the index into the ports on the correct split roothub, and the
1609          * correct bus_state structure.
1610          */
1611         /* Find the right roothub. */
1612         hcd = xhci_to_hcd(xhci);
1613         if ((major_revision == 0x03) != (hcd->speed == HCD_USB3))
1614                 hcd = xhci->shared_hcd;
1615         bus_state = &xhci->bus_state[hcd_index(hcd)];
1616         if (hcd->speed == HCD_USB3)
1617                 port_array = xhci->usb3_ports;
1618         else
1619                 port_array = xhci->usb2_ports;
1620         /* Find the faked port hub number */
1621         faked_port_index = find_faked_portnum_from_hw_portnum(hcd, xhci,
1622                         port_id);
1623
1624         temp = xhci_readl(xhci, port_array[faked_port_index]);
1625         if (hcd->state == HC_STATE_SUSPENDED) {
1626                 xhci_dbg(xhci, "resume root hub\n");
1627                 usb_hcd_resume_root_hub(hcd);
1628         }
1629
1630         if ((temp & PORT_PLC) && (temp & PORT_PLS_MASK) == XDEV_RESUME) {
1631                 xhci_dbg(xhci, "port resume event for port %d\n", port_id);
1632
1633                 temp1 = xhci_readl(xhci, &xhci->op_regs->command);
1634                 if (!(temp1 & CMD_RUN)) {
1635                         xhci_warn(xhci, "xHC is not running.\n");
1636                         goto cleanup;
1637                 }
1638
1639                 if (DEV_SUPERSPEED(temp)) {
1640                         xhci_dbg(xhci, "resume SS port %d\n", port_id);
1641                         xhci_set_link_state(xhci, port_array, faked_port_index,
1642                                                 XDEV_U0);
1643                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1644                                         faked_port_index + 1);
1645                         if (!slot_id) {
1646                                 xhci_dbg(xhci, "slot_id is zero\n");
1647                                 goto cleanup;
1648                         }
1649                         xhci_ring_device(xhci, slot_id);
1650                         xhci_dbg(xhci, "resume SS port %d finished\n", port_id);
1651                         /* Clear PORT_PLC */
1652                         xhci_test_and_clear_bit(xhci, port_array,
1653                                                 faked_port_index, PORT_PLC);
1654                 } else {
1655                         xhci_dbg(xhci, "resume HS port %d\n", port_id);
1656                         bus_state->resume_done[faked_port_index] = jiffies +
1657                                 msecs_to_jiffies(20);
1658                         mod_timer(&hcd->rh_timer,
1659                                   bus_state->resume_done[faked_port_index]);
1660                         /* Do the rest in GetPortStatus */
1661                 }
1662         }
1663
1664         if (hcd->speed != HCD_USB3)
1665                 xhci_test_and_clear_bit(xhci, port_array, faked_port_index,
1666                                         PORT_PLC);
1667
1668 cleanup:
1669         /* Update event ring dequeue pointer before dropping the lock */
1670         inc_deq(xhci, xhci->event_ring, true);
1671
1672         /* Don't make the USB core poll the roothub if we got a bad port status
1673          * change event.  Besides, at that point we can't tell which roothub
1674          * (USB 2.0 or USB 3.0) to kick.
1675          */
1676         if (bogus_port_status)
1677                 return;
1678
1679         /*
1680          * xHCI port-status-change events occur when the "or" of all the
1681          * status-change bits in the portsc register changes from 0 to 1.
1682          * New status changes won't cause an event if any other change
1683          * bits are still set.  When an event occurs, switch over to
1684          * polling to avoid losing status changes.
1685          */
1686         xhci_dbg(xhci, "%s: starting port polling.\n", __func__);
1687         set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
1688         spin_unlock(&xhci->lock);
1689         /* Pass this up to the core */
1690         usb_hcd_poll_rh_status(hcd);
1691         spin_lock(&xhci->lock);
1692 }
1693
1694 /*
1695  * This TD is defined by the TRBs starting at start_trb in start_seg and ending
1696  * at end_trb, which may be in another segment.  If the suspect DMA address is a
1697  * TRB in this TD, this function returns that TRB's segment.  Otherwise it
1698  * returns 0.
1699  */
1700 struct xhci_segment *trb_in_td(struct xhci_segment *start_seg,
1701                 union xhci_trb  *start_trb,
1702                 union xhci_trb  *end_trb,
1703                 dma_addr_t      suspect_dma)
1704 {
1705         dma_addr_t start_dma;
1706         dma_addr_t end_seg_dma;
1707         dma_addr_t end_trb_dma;
1708         struct xhci_segment *cur_seg;
1709
1710         start_dma = xhci_trb_virt_to_dma(start_seg, start_trb);
1711         cur_seg = start_seg;
1712
1713         do {
1714                 if (start_dma == 0)
1715                         return NULL;
1716                 /* We may get an event for a Link TRB in the middle of a TD */
1717                 end_seg_dma = xhci_trb_virt_to_dma(cur_seg,
1718                                 &cur_seg->trbs[TRBS_PER_SEGMENT - 1]);
1719                 /* If the end TRB isn't in this segment, this is set to 0 */
1720                 end_trb_dma = xhci_trb_virt_to_dma(cur_seg, end_trb);
1721
1722                 if (end_trb_dma > 0) {
1723                         /* The end TRB is in this segment, so suspect should be here */
1724                         if (start_dma <= end_trb_dma) {
1725                                 if (suspect_dma >= start_dma && suspect_dma <= end_trb_dma)
1726                                         return cur_seg;
1727                         } else {
1728                                 /* Case for one segment with
1729                                  * a TD wrapped around to the top
1730                                  */
1731                                 if ((suspect_dma >= start_dma &&
1732                                                         suspect_dma <= end_seg_dma) ||
1733                                                 (suspect_dma >= cur_seg->dma &&
1734                                                  suspect_dma <= end_trb_dma))
1735                                         return cur_seg;
1736                         }
1737                         return NULL;
1738                 } else {
1739                         /* Might still be somewhere in this segment */
1740                         if (suspect_dma >= start_dma && suspect_dma <= end_seg_dma)
1741                                 return cur_seg;
1742                 }
1743                 cur_seg = cur_seg->next;
1744                 start_dma = xhci_trb_virt_to_dma(cur_seg, &cur_seg->trbs[0]);
1745         } while (cur_seg != start_seg);
1746
1747         return NULL;
1748 }
1749
1750 static void xhci_cleanup_halted_endpoint(struct xhci_hcd *xhci,
1751                 unsigned int slot_id, unsigned int ep_index,
1752                 unsigned int stream_id,
1753                 struct xhci_td *td, union xhci_trb *event_trb)
1754 {
1755         struct xhci_virt_ep *ep = &xhci->devs[slot_id]->eps[ep_index];
1756         ep->ep_state |= EP_HALTED;
1757         ep->stopped_td = td;
1758         ep->stopped_stream = stream_id;
1759
1760         xhci_queue_reset_ep(xhci, slot_id, ep_index);
1761         xhci_cleanup_stalled_ring(xhci, td->urb->dev, ep_index);
1762
1763         ep->stopped_td = NULL;
1764         ep->stopped_stream = 0;
1765
1766         xhci_ring_cmd_db(xhci);
1767 }
1768
1769 /* Check if an error has halted the endpoint ring.  The class driver will
1770  * cleanup the halt for a non-default control endpoint if we indicate a stall.
1771  * However, a babble and other errors also halt the endpoint ring, and the class
1772  * driver won't clear the halt in that case, so we need to issue a Set Transfer
1773  * Ring Dequeue Pointer command manually.
1774  */
1775 static int xhci_requires_manual_halt_cleanup(struct xhci_hcd *xhci,
1776                 struct xhci_ep_ctx *ep_ctx,
1777                 unsigned int trb_comp_code)
1778 {
1779         /* TRB completion codes that may require a manual halt cleanup */
1780         if (trb_comp_code == COMP_TX_ERR ||
1781                         trb_comp_code == COMP_BABBLE ||
1782                         trb_comp_code == COMP_SPLIT_ERR)
1783                 /* The 0.96 spec says a babbling control endpoint
1784                  * is not halted. The 0.96 spec says it is.  Some HW
1785                  * claims to be 0.95 compliant, but it halts the control
1786                  * endpoint anyway.  Check if a babble halted the
1787                  * endpoint.
1788                  */
1789                 if ((ep_ctx->ep_info & cpu_to_le32(EP_STATE_MASK)) ==
1790                     cpu_to_le32(EP_STATE_HALTED))
1791                         return 1;
1792
1793         return 0;
1794 }
1795
1796 int xhci_is_vendor_info_code(struct xhci_hcd *xhci, unsigned int trb_comp_code)
1797 {
1798         if (trb_comp_code >= 224 && trb_comp_code <= 255) {
1799                 /* Vendor defined "informational" completion code,
1800                  * treat as not-an-error.
1801                  */
1802                 xhci_dbg(xhci, "Vendor defined info completion code %u\n",
1803                                 trb_comp_code);
1804                 xhci_dbg(xhci, "Treating code as success.\n");
1805                 return 1;
1806         }
1807         return 0;
1808 }
1809
1810 /*
1811  * Finish the td processing, remove the td from td list;
1812  * Return 1 if the urb can be given back.
1813  */
1814 static int finish_td(struct xhci_hcd *xhci, struct xhci_td *td,
1815         union xhci_trb *event_trb, struct xhci_transfer_event *event,
1816         struct xhci_virt_ep *ep, int *status, bool skip)
1817 {
1818         struct xhci_virt_device *xdev;
1819         struct xhci_ring *ep_ring;
1820         unsigned int slot_id;
1821         int ep_index;
1822         struct urb *urb = NULL;
1823         struct xhci_ep_ctx *ep_ctx;
1824         int ret = 0;
1825         struct urb_priv *urb_priv;
1826         u32 trb_comp_code;
1827
1828         slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags));
1829         xdev = xhci->devs[slot_id];
1830         ep_index = TRB_TO_EP_ID(le32_to_cpu(event->flags)) - 1;
1831         ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
1832         ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index);
1833         trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
1834
1835         if (skip)
1836                 goto td_cleanup;
1837
1838         if (trb_comp_code == COMP_STOP_INVAL ||
1839                         trb_comp_code == COMP_STOP) {
1840                 /* The Endpoint Stop Command completion will take care of any
1841                  * stopped TDs.  A stopped TD may be restarted, so don't update
1842                  * the ring dequeue pointer or take this TD off any lists yet.
1843                  */
1844                 ep->stopped_td = td;
1845                 return 0;
1846         } else {
1847                 if (trb_comp_code == COMP_STALL) {
1848                         /* The transfer is completed from the driver's
1849                          * perspective, but we need to issue a set dequeue
1850                          * command for this stalled endpoint to move the dequeue
1851                          * pointer past the TD.  We can't do that here because
1852                          * the halt condition must be cleared first.  Let the
1853                          * USB class driver clear the stall later.
1854                          */
1855                         ep->stopped_td = td;
1856                         ep->stopped_stream = ep_ring->stream_id;
1857                 } else if (xhci_requires_manual_halt_cleanup(xhci,
1858                                         ep_ctx, trb_comp_code)) {
1859                         /* Other types of errors halt the endpoint, but the
1860                          * class driver doesn't call usb_reset_endpoint() unless
1861                          * the error is -EPIPE.  Clear the halted status in the
1862                          * xHCI hardware manually.
1863                          */
1864                         xhci_cleanup_halted_endpoint(xhci,
1865                                         slot_id, ep_index, ep_ring->stream_id,
1866                                         td, event_trb);
1867                 } else {
1868                         /* Update ring dequeue pointer */
1869                         while (ep_ring->dequeue != td->last_trb)
1870                                 inc_deq(xhci, ep_ring, false);
1871                         inc_deq(xhci, ep_ring, false);
1872                 }
1873
1874 td_cleanup:
1875                 /* Clean up the endpoint's TD list */
1876                 urb = td->urb;
1877                 urb_priv = urb->hcpriv;
1878
1879                 /* Do one last check of the actual transfer length.
1880                  * If the host controller said we transferred more data than
1881                  * the buffer length, urb->actual_length will be a very big
1882                  * number (since it's unsigned).  Play it safe and say we didn't
1883                  * transfer anything.
1884                  */
1885                 if (urb->actual_length > urb->transfer_buffer_length) {
1886                         xhci_warn(xhci, "URB transfer length is wrong, "
1887                                         "xHC issue? req. len = %u, "
1888                                         "act. len = %u\n",
1889                                         urb->transfer_buffer_length,
1890                                         urb->actual_length);
1891                         urb->actual_length = 0;
1892                         if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
1893                                 *status = -EREMOTEIO;
1894                         else
1895                                 *status = 0;
1896                 }
1897                 list_del_init(&td->td_list);
1898                 /* Was this TD slated to be cancelled but completed anyway? */
1899                 if (!list_empty(&td->cancelled_td_list))
1900                         list_del_init(&td->cancelled_td_list);
1901
1902                 urb_priv->td_cnt++;
1903                 /* Giveback the urb when all the tds are completed */
1904                 if (urb_priv->td_cnt == urb_priv->length) {
1905                         ret = 1;
1906                         if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
1907                                 xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs--;
1908                                 if (xhci_to_hcd(xhci)->self.bandwidth_isoc_reqs
1909                                         == 0) {
1910                                         if (xhci->quirks & XHCI_AMD_PLL_FIX)
1911                                                 usb_amd_quirk_pll_enable();
1912                                 }
1913                         }
1914                 }
1915         }
1916
1917         return ret;
1918 }
1919
1920 /*
1921  * Process control tds, update urb status and actual_length.
1922  */
1923 static int process_ctrl_td(struct xhci_hcd *xhci, struct xhci_td *td,
1924         union xhci_trb *event_trb, struct xhci_transfer_event *event,
1925         struct xhci_virt_ep *ep, int *status)
1926 {
1927         struct xhci_virt_device *xdev;
1928         struct xhci_ring *ep_ring;
1929         unsigned int slot_id;
1930         int ep_index;
1931         struct xhci_ep_ctx *ep_ctx;
1932         u32 trb_comp_code;
1933
1934         slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags));
1935         xdev = xhci->devs[slot_id];
1936         ep_index = TRB_TO_EP_ID(le32_to_cpu(event->flags)) - 1;
1937         ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
1938         ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index);
1939         trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
1940
1941         xhci_debug_trb(xhci, xhci->event_ring->dequeue);
1942         switch (trb_comp_code) {
1943         case COMP_SUCCESS:
1944                 if (event_trb == ep_ring->dequeue) {
1945                         xhci_warn(xhci, "WARN: Success on ctrl setup TRB "
1946                                         "without IOC set??\n");
1947                         *status = -ESHUTDOWN;
1948                 } else if (event_trb != td->last_trb) {
1949                         xhci_warn(xhci, "WARN: Success on ctrl data TRB "
1950                                         "without IOC set??\n");
1951                         *status = -ESHUTDOWN;
1952                 } else {
1953                         *status = 0;
1954                 }
1955                 break;
1956         case COMP_SHORT_TX:
1957                 if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
1958                         *status = -EREMOTEIO;
1959                 else
1960                         *status = 0;
1961                 break;
1962         case COMP_STOP_INVAL:
1963         case COMP_STOP:
1964                 return finish_td(xhci, td, event_trb, event, ep, status, false);
1965         default:
1966                 if (!xhci_requires_manual_halt_cleanup(xhci,
1967                                         ep_ctx, trb_comp_code))
1968                         break;
1969                 xhci_dbg(xhci, "TRB error code %u, "
1970                                 "halted endpoint index = %u\n",
1971                                 trb_comp_code, ep_index);
1972                 /* else fall through */
1973         case COMP_STALL:
1974                 /* Did we transfer part of the data (middle) phase? */
1975                 if (event_trb != ep_ring->dequeue &&
1976                                 event_trb != td->last_trb)
1977                         td->urb->actual_length =
1978                                 td->urb->transfer_buffer_length -
1979                                 EVENT_TRB_LEN(le32_to_cpu(event->transfer_len));
1980                 else
1981                         td->urb->actual_length = 0;
1982
1983                 xhci_cleanup_halted_endpoint(xhci,
1984                         slot_id, ep_index, 0, td, event_trb);
1985                 return finish_td(xhci, td, event_trb, event, ep, status, true);
1986         }
1987         /*
1988          * Did we transfer any data, despite the errors that might have
1989          * happened?  I.e. did we get past the setup stage?
1990          */
1991         if (event_trb != ep_ring->dequeue) {
1992                 /* The event was for the status stage */
1993                 if (event_trb == td->last_trb) {
1994                         if (td->urb->actual_length != 0) {
1995                                 /* Don't overwrite a previously set error code
1996                                  */
1997                                 if ((*status == -EINPROGRESS || *status == 0) &&
1998                                                 (td->urb->transfer_flags
1999                                                  & URB_SHORT_NOT_OK))
2000                                         /* Did we already see a short data
2001                                          * stage? */
2002                                         *status = -EREMOTEIO;
2003                         } else {
2004                                 td->urb->actual_length =
2005                                         td->urb->transfer_buffer_length;
2006                         }
2007                 } else {
2008                 /* Maybe the event was for the data stage? */
2009                         td->urb->actual_length =
2010                                 td->urb->transfer_buffer_length -
2011                                 EVENT_TRB_LEN(le32_to_cpu(event->transfer_len));
2012                         xhci_dbg(xhci, "Waiting for status "
2013                                         "stage event\n");
2014                         return 0;
2015                 }
2016         }
2017
2018         return finish_td(xhci, td, event_trb, event, ep, status, false);
2019 }
2020
2021 /*
2022  * Process isochronous tds, update urb packet status and actual_length.
2023  */
2024 static int process_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td,
2025         union xhci_trb *event_trb, struct xhci_transfer_event *event,
2026         struct xhci_virt_ep *ep, int *status)
2027 {
2028         struct xhci_ring *ep_ring;
2029         struct urb_priv *urb_priv;
2030         int idx;
2031         int len = 0;
2032         union xhci_trb *cur_trb;
2033         struct xhci_segment *cur_seg;
2034         struct usb_iso_packet_descriptor *frame;
2035         u32 trb_comp_code;
2036         bool skip_td = false;
2037
2038         ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
2039         trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
2040         urb_priv = td->urb->hcpriv;
2041         idx = urb_priv->td_cnt;
2042         frame = &td->urb->iso_frame_desc[idx];
2043
2044         /* handle completion code */
2045         switch (trb_comp_code) {
2046         case COMP_SUCCESS:
2047                 if (EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) == 0) {
2048                         frame->status = 0;
2049                         break;
2050                 }
2051                 if ((xhci->quirks & XHCI_TRUST_TX_LENGTH))
2052                         trb_comp_code = COMP_SHORT_TX;
2053         case COMP_SHORT_TX:
2054                 frame->status = td->urb->transfer_flags & URB_SHORT_NOT_OK ?
2055                                 -EREMOTEIO : 0;
2056                 break;
2057         case COMP_BW_OVER:
2058                 frame->status = -ECOMM;
2059                 skip_td = true;
2060                 break;
2061         case COMP_BUFF_OVER:
2062         case COMP_BABBLE:
2063                 frame->status = -EOVERFLOW;
2064                 skip_td = true;
2065                 break;
2066         case COMP_DEV_ERR:
2067         case COMP_STALL:
2068         case COMP_TX_ERR:
2069                 frame->status = -EPROTO;
2070                 skip_td = true;
2071                 break;
2072         case COMP_STOP:
2073         case COMP_STOP_INVAL:
2074                 break;
2075         default:
2076                 frame->status = -1;
2077                 break;
2078         }
2079
2080         if (trb_comp_code == COMP_SUCCESS || skip_td) {
2081                 frame->actual_length = frame->length;
2082                 td->urb->actual_length += frame->length;
2083         } else {
2084                 for (cur_trb = ep_ring->dequeue,
2085                      cur_seg = ep_ring->deq_seg; cur_trb != event_trb;
2086                      next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) {
2087                         if (!TRB_TYPE_NOOP_LE32(cur_trb->generic.field[3]) &&
2088                             !TRB_TYPE_LINK_LE32(cur_trb->generic.field[3]))
2089                                 len += TRB_LEN(le32_to_cpu(cur_trb->generic.field[2]));
2090                 }
2091                 len += TRB_LEN(le32_to_cpu(cur_trb->generic.field[2])) -
2092                         EVENT_TRB_LEN(le32_to_cpu(event->transfer_len));
2093
2094                 if (trb_comp_code != COMP_STOP_INVAL) {
2095                         frame->actual_length = len;
2096                         td->urb->actual_length += len;
2097                 }
2098         }
2099
2100         return finish_td(xhci, td, event_trb, event, ep, status, false);
2101 }
2102
2103 static int skip_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td,
2104                         struct xhci_transfer_event *event,
2105                         struct xhci_virt_ep *ep, int *status)
2106 {
2107         struct xhci_ring *ep_ring;
2108         struct urb_priv *urb_priv;
2109         struct usb_iso_packet_descriptor *frame;
2110         int idx;
2111
2112         ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
2113         urb_priv = td->urb->hcpriv;
2114         idx = urb_priv->td_cnt;
2115         frame = &td->urb->iso_frame_desc[idx];
2116
2117         /* The transfer is partly done. */
2118         frame->status = -EXDEV;
2119
2120         /* calc actual length */
2121         frame->actual_length = 0;
2122
2123         /* Update ring dequeue pointer */
2124         while (ep_ring->dequeue != td->last_trb)
2125                 inc_deq(xhci, ep_ring, false);
2126         inc_deq(xhci, ep_ring, false);
2127
2128         return finish_td(xhci, td, NULL, event, ep, status, true);
2129 }
2130
2131 /*
2132  * Process bulk and interrupt tds, update urb status and actual_length.
2133  */
2134 static int process_bulk_intr_td(struct xhci_hcd *xhci, struct xhci_td *td,
2135         union xhci_trb *event_trb, struct xhci_transfer_event *event,
2136         struct xhci_virt_ep *ep, int *status)
2137 {
2138         struct xhci_ring *ep_ring;
2139         union xhci_trb *cur_trb;
2140         struct xhci_segment *cur_seg;
2141         u32 trb_comp_code;
2142
2143         ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
2144         trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
2145
2146         switch (trb_comp_code) {
2147         case COMP_SUCCESS:
2148                 /* Double check that the HW transferred everything. */
2149                 if (event_trb != td->last_trb ||
2150                     EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) != 0) {
2151                         xhci_warn(xhci, "WARN Successful completion "
2152                                         "on short TX\n");
2153                         if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
2154                                 *status = -EREMOTEIO;
2155                         else
2156                                 *status = 0;
2157                         if ((xhci->quirks & XHCI_TRUST_TX_LENGTH))
2158                                 trb_comp_code = COMP_SHORT_TX;
2159                 } else {
2160                         *status = 0;
2161                 }
2162                 break;
2163         case COMP_SHORT_TX:
2164                 if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
2165                         *status = -EREMOTEIO;
2166                 else
2167                         *status = 0;
2168                 break;
2169         default:
2170                 /* Others already handled above */
2171                 break;
2172         }
2173         if (trb_comp_code == COMP_SHORT_TX)
2174                 xhci_dbg(xhci, "ep %#x - asked for %d bytes, "
2175                                 "%d bytes untransferred\n",
2176                                 td->urb->ep->desc.bEndpointAddress,
2177                                 td->urb->transfer_buffer_length,
2178                                 EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)));
2179         /* Fast path - was this the last TRB in the TD for this URB? */
2180         if (event_trb == td->last_trb) {
2181                 if (EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) != 0) {
2182                         td->urb->actual_length =
2183                                 td->urb->transfer_buffer_length -
2184                                 EVENT_TRB_LEN(le32_to_cpu(event->transfer_len));
2185                         if (td->urb->transfer_buffer_length <
2186                                         td->urb->actual_length) {
2187                                 xhci_warn(xhci, "HC gave bad length "
2188                                                 "of %d bytes left\n",
2189                                           EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)));
2190                                 td->urb->actual_length = 0;
2191                                 if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
2192                                         *status = -EREMOTEIO;
2193                                 else
2194                                         *status = 0;
2195                         }
2196                         /* Don't overwrite a previously set error code */
2197                         if (*status == -EINPROGRESS) {
2198                                 if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
2199                                         *status = -EREMOTEIO;
2200                                 else
2201                                         *status = 0;
2202                         }
2203                 } else {
2204                         td->urb->actual_length =
2205                                 td->urb->transfer_buffer_length;
2206                         /* Ignore a short packet completion if the
2207                          * untransferred length was zero.
2208                          */
2209                         if (*status == -EREMOTEIO)
2210                                 *status = 0;
2211                 }
2212         } else {
2213                 /* Slow path - walk the list, starting from the dequeue
2214                  * pointer, to get the actual length transferred.
2215                  */
2216                 td->urb->actual_length = 0;
2217                 for (cur_trb = ep_ring->dequeue, cur_seg = ep_ring->deq_seg;
2218                                 cur_trb != event_trb;
2219                                 next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) {
2220                         if (!TRB_TYPE_NOOP_LE32(cur_trb->generic.field[3]) &&
2221                             !TRB_TYPE_LINK_LE32(cur_trb->generic.field[3]))
2222                                 td->urb->actual_length +=
2223                                         TRB_LEN(le32_to_cpu(cur_trb->generic.field[2]));
2224                 }
2225                 /* If the ring didn't stop on a Link or No-op TRB, add
2226                  * in the actual bytes transferred from the Normal TRB
2227                  */
2228                 if (trb_comp_code != COMP_STOP_INVAL)
2229                         td->urb->actual_length +=
2230                                 TRB_LEN(le32_to_cpu(cur_trb->generic.field[2])) -
2231                                 EVENT_TRB_LEN(le32_to_cpu(event->transfer_len));
2232         }
2233
2234         return finish_td(xhci, td, event_trb, event, ep, status, false);
2235 }
2236
2237 /*
2238  * If this function returns an error condition, it means it got a Transfer
2239  * event with a corrupted Slot ID, Endpoint ID, or TRB DMA address.
2240  * At this point, the host controller is probably hosed and should be reset.
2241  */
2242 static int handle_tx_event(struct xhci_hcd *xhci,
2243                 struct xhci_transfer_event *event)
2244 {
2245         struct xhci_virt_device *xdev;
2246         struct xhci_virt_ep *ep;
2247         struct xhci_ring *ep_ring;
2248         unsigned int slot_id;
2249         int ep_index;
2250         struct xhci_td *td = NULL;
2251         dma_addr_t event_dma;
2252         struct xhci_segment *event_seg;
2253         union xhci_trb *event_trb;
2254         struct urb *urb = NULL;
2255         int status = -EINPROGRESS;
2256         struct urb_priv *urb_priv;
2257         struct xhci_ep_ctx *ep_ctx;
2258         struct list_head *tmp;
2259         u32 trb_comp_code;
2260         int ret = 0;
2261         int td_num = 0;
2262
2263         slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags));
2264         xdev = xhci->devs[slot_id];
2265         if (!xdev) {
2266                 xhci_err(xhci, "ERROR Transfer event pointed to bad slot\n");
2267                 return -ENODEV;
2268         }
2269
2270         /* Endpoint ID is 1 based, our index is zero based */
2271         ep_index = TRB_TO_EP_ID(le32_to_cpu(event->flags)) - 1;
2272         ep = &xdev->eps[ep_index];
2273         ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
2274         ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index);
2275         if (!ep_ring ||
2276             (le32_to_cpu(ep_ctx->ep_info) & EP_STATE_MASK) ==
2277             EP_STATE_DISABLED) {
2278                 xhci_err(xhci, "ERROR Transfer event for disabled endpoint "
2279                                 "or incorrect stream ring\n");
2280                 return -ENODEV;
2281         }
2282
2283         /* Count current td numbers if ep->skip is set */
2284         if (ep->skip) {
2285                 list_for_each(tmp, &ep_ring->td_list)
2286                         td_num++;
2287         }
2288
2289         event_dma = le64_to_cpu(event->buffer);
2290         trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
2291         /* Look for common error cases */
2292         switch (trb_comp_code) {
2293         /* Skip codes that require special handling depending on
2294          * transfer type
2295          */
2296         case COMP_SUCCESS:
2297                 if (EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) == 0)
2298                         break;
2299                 if (xhci->quirks & XHCI_TRUST_TX_LENGTH)
2300                         trb_comp_code = COMP_SHORT_TX;
2301                 else
2302                         xhci_warn(xhci, "WARN Successful completion on short TX: "
2303                                         "needs XHCI_TRUST_TX_LENGTH quirk?\n");
2304         case COMP_SHORT_TX:
2305                 break;
2306         case COMP_STOP:
2307                 xhci_dbg(xhci, "Stopped on Transfer TRB\n");
2308                 break;
2309         case COMP_STOP_INVAL:
2310                 xhci_dbg(xhci, "Stopped on No-op or Link TRB\n");
2311                 break;
2312         case COMP_STALL:
2313                 xhci_dbg(xhci, "Stalled endpoint\n");
2314                 ep->ep_state |= EP_HALTED;
2315                 status = -EPIPE;
2316                 break;
2317         case COMP_TRB_ERR:
2318                 xhci_warn(xhci, "WARN: TRB error on endpoint\n");
2319                 status = -EILSEQ;
2320                 break;
2321         case COMP_SPLIT_ERR:
2322         case COMP_TX_ERR:
2323                 xhci_dbg(xhci, "Transfer error on endpoint\n");
2324                 status = -EPROTO;
2325                 break;
2326         case COMP_BABBLE:
2327                 xhci_dbg(xhci, "Babble error on endpoint\n");
2328                 status = -EOVERFLOW;
2329                 break;
2330         case COMP_DB_ERR:
2331                 xhci_warn(xhci, "WARN: HC couldn't access mem fast enough\n");
2332                 status = -ENOSR;
2333                 break;
2334         case COMP_BW_OVER:
2335                 xhci_warn(xhci, "WARN: bandwidth overrun event on endpoint\n");
2336                 break;
2337         case COMP_BUFF_OVER:
2338                 xhci_warn(xhci, "WARN: buffer overrun event on endpoint\n");
2339                 break;
2340         case COMP_UNDERRUN:
2341                 /*
2342                  * When the Isoch ring is empty, the xHC will generate
2343                  * a Ring Overrun Event for IN Isoch endpoint or Ring
2344                  * Underrun Event for OUT Isoch endpoint.
2345                  */
2346                 xhci_dbg(xhci, "underrun event on endpoint\n");
2347                 if (!list_empty(&ep_ring->td_list))
2348                         xhci_dbg(xhci, "Underrun Event for slot %d ep %d "
2349                                         "still with TDs queued?\n",
2350                                  TRB_TO_SLOT_ID(le32_to_cpu(event->flags)),
2351                                  ep_index);
2352                 goto cleanup;
2353         case COMP_OVERRUN:
2354                 xhci_dbg(xhci, "overrun event on endpoint\n");
2355                 if (!list_empty(&ep_ring->td_list))
2356                         xhci_dbg(xhci, "Overrun Event for slot %d ep %d "
2357                                         "still with TDs queued?\n",
2358                                  TRB_TO_SLOT_ID(le32_to_cpu(event->flags)),
2359                                  ep_index);
2360                 goto cleanup;
2361         case COMP_DEV_ERR:
2362                 xhci_warn(xhci, "WARN: detect an incompatible device");
2363                 status = -EPROTO;
2364                 break;
2365         case COMP_MISSED_INT:
2366                 /*
2367                  * When encounter missed service error, one or more isoc tds
2368                  * may be missed by xHC.
2369                  * Set skip flag of the ep_ring; Complete the missed tds as
2370                  * short transfer when process the ep_ring next time.
2371                  */
2372                 ep->skip = true;
2373                 xhci_dbg(xhci, "Miss service interval error, set skip flag\n");
2374                 goto cleanup;
2375         default:
2376                 if (xhci_is_vendor_info_code(xhci, trb_comp_code)) {
2377                         status = 0;
2378                         break;
2379                 }
2380                 xhci_warn(xhci, "ERROR Unknown event condition, HC probably "
2381                                 "busted\n");
2382                 goto cleanup;
2383         }
2384
2385         do {
2386                 /* This TRB should be in the TD at the head of this ring's
2387                  * TD list.
2388                  */
2389                 if (list_empty(&ep_ring->td_list)) {
2390                         /*
2391                          * A stopped endpoint may generate an extra completion
2392                          * event if the device was suspended.  Don't print
2393                          * warnings.
2394                          */
2395                         if (!(trb_comp_code == COMP_STOP ||
2396                                                 trb_comp_code == COMP_STOP_INVAL)) {
2397                                 xhci_warn(xhci, "WARN Event TRB for slot %d ep %d with no TDs queued?\n",
2398                                                 TRB_TO_SLOT_ID(le32_to_cpu(event->flags)),
2399                                                 ep_index);
2400                                 xhci_dbg(xhci, "Event TRB with TRB type ID %u\n",
2401                                                 (le32_to_cpu(event->flags) &
2402                                                  TRB_TYPE_BITMASK)>>10);
2403                                 xhci_print_trb_offsets(xhci, (union xhci_trb *) event);
2404                         }
2405                         if (ep->skip) {
2406                                 ep->skip = false;
2407                                 xhci_dbg(xhci, "td_list is empty while skip "
2408                                                 "flag set. Clear skip flag.\n");
2409                         }
2410                         ret = 0;
2411                         goto cleanup;
2412                 }
2413
2414                 /* We've skipped all the TDs on the ep ring when ep->skip set */
2415                 if (ep->skip && td_num == 0) {
2416                         ep->skip = false;
2417                         xhci_dbg(xhci, "All tds on the ep_ring skipped. "
2418                                                 "Clear skip flag.\n");
2419                         ret = 0;
2420                         goto cleanup;
2421                 }
2422
2423                 td = list_entry(ep_ring->td_list.next, struct xhci_td, td_list);
2424                 if (ep->skip)
2425                         td_num--;
2426
2427                 /* Is this a TRB in the currently executing TD? */
2428                 event_seg = trb_in_td(ep_ring->deq_seg, ep_ring->dequeue,
2429                                 td->last_trb, event_dma);
2430
2431                 /*
2432                  * Skip the Force Stopped Event. The event_trb(event_dma) of FSE
2433                  * is not in the current TD pointed by ep_ring->dequeue because
2434                  * that the hardware dequeue pointer still at the previous TRB
2435                  * of the current TD. The previous TRB maybe a Link TD or the
2436                  * last TRB of the previous TD. The command completion handle
2437                  * will take care the rest.
2438                  */
2439                 if (!event_seg && (trb_comp_code == COMP_STOP ||
2440                                    trb_comp_code == COMP_STOP_INVAL)) {
2441                         ret = 0;
2442                         goto cleanup;
2443                 }
2444
2445                 if (!event_seg) {
2446                         if (!ep->skip ||
2447                             !usb_endpoint_xfer_isoc(&td->urb->ep->desc)) {
2448                                 /* Some host controllers give a spurious
2449                                  * successful event after a short transfer.
2450                                  * Ignore it.
2451                                  */
2452                                 if ((xhci->quirks & XHCI_SPURIOUS_SUCCESS) &&
2453                                                 ep_ring->last_td_was_short) {
2454                                         ep_ring->last_td_was_short = false;
2455                                         ret = 0;
2456                                         goto cleanup;
2457                                 }
2458                                 /* HC is busted, give up! */
2459                                 xhci_err(xhci,
2460                                         "ERROR Transfer event TRB DMA ptr not "
2461                                         "part of current TD\n");
2462                                 return -ESHUTDOWN;
2463                         }
2464
2465                         ret = skip_isoc_td(xhci, td, event, ep, &status);
2466                         goto cleanup;
2467                 }
2468                 if (trb_comp_code == COMP_SHORT_TX)
2469                         ep_ring->last_td_was_short = true;
2470                 else
2471                         ep_ring->last_td_was_short = false;
2472
2473                 if (ep->skip) {
2474                         xhci_dbg(xhci, "Found td. Clear skip flag.\n");
2475                         ep->skip = false;
2476                 }
2477
2478                 event_trb = &event_seg->trbs[(event_dma - event_seg->dma) /
2479                                                 sizeof(*event_trb)];
2480                 /*
2481                  * No-op TRB should not trigger interrupts.
2482                  * If event_trb is a no-op TRB, it means the
2483                  * corresponding TD has been cancelled. Just ignore
2484                  * the TD.
2485                  */
2486                 if (TRB_TYPE_NOOP_LE32(event_trb->generic.field[3])) {
2487                         xhci_dbg(xhci,
2488                                  "event_trb is a no-op TRB. Skip it\n");
2489                         goto cleanup;
2490                 }
2491
2492                 /* Now update the urb's actual_length and give back to
2493                  * the core
2494                  */
2495                 if (usb_endpoint_xfer_control(&td->urb->ep->desc))
2496                         ret = process_ctrl_td(xhci, td, event_trb, event, ep,
2497                                                  &status);
2498                 else if (usb_endpoint_xfer_isoc(&td->urb->ep->desc))
2499                         ret = process_isoc_td(xhci, td, event_trb, event, ep,
2500                                                  &status);
2501                 else
2502                         ret = process_bulk_intr_td(xhci, td, event_trb, event,
2503                                                  ep, &status);
2504
2505 cleanup:
2506                 /*
2507                  * Do not update event ring dequeue pointer if ep->skip is set.
2508                  * Will roll back to continue process missed tds.
2509                  */
2510                 if (trb_comp_code == COMP_MISSED_INT || !ep->skip) {
2511                         inc_deq(xhci, xhci->event_ring, true);
2512                 }
2513
2514                 if (ret) {
2515                         urb = td->urb;
2516                         urb_priv = urb->hcpriv;
2517                         /* Leave the TD around for the reset endpoint function
2518                          * to use(but only if it's not a control endpoint,
2519                          * since we already queued the Set TR dequeue pointer
2520                          * command for stalled control endpoints).
2521                          */
2522                         if (usb_endpoint_xfer_control(&urb->ep->desc) ||
2523                                 (trb_comp_code != COMP_STALL &&
2524                                         trb_comp_code != COMP_BABBLE))
2525                                 xhci_urb_free_priv(xhci, urb_priv);
2526                         else
2527                                 kfree(urb_priv);
2528
2529                         usb_hcd_unlink_urb_from_ep(bus_to_hcd(urb->dev->bus), urb);
2530                         if ((urb->actual_length != urb->transfer_buffer_length &&
2531                                                 (urb->transfer_flags &
2532                                                  URB_SHORT_NOT_OK)) ||
2533                                         (status != 0 &&
2534                                          !usb_endpoint_xfer_isoc(&urb->ep->desc)))
2535                                 xhci_dbg(xhci, "Giveback URB %p, len = %d, "
2536                                                 "expected = %x, status = %d\n",
2537                                                 urb, urb->actual_length,
2538                                                 urb->transfer_buffer_length,
2539                                                 status);
2540                         spin_unlock(&xhci->lock);
2541                         /* EHCI, UHCI, and OHCI always unconditionally set the
2542                          * urb->status of an isochronous endpoint to 0.
2543                          */
2544                         if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
2545                                 status = 0;
2546                         usb_hcd_giveback_urb(bus_to_hcd(urb->dev->bus), urb, status);
2547                         spin_lock(&xhci->lock);
2548                 }
2549
2550         /*
2551          * If ep->skip is set, it means there are missed tds on the
2552          * endpoint ring need to take care of.
2553          * Process them as short transfer until reach the td pointed by
2554          * the event.
2555          */
2556         } while (ep->skip && trb_comp_code != COMP_MISSED_INT);
2557
2558         return 0;
2559 }
2560
2561 /*
2562  * This function handles all OS-owned events on the event ring.  It may drop
2563  * xhci->lock between event processing (e.g. to pass up port status changes).
2564  * Returns >0 for "possibly more events to process" (caller should call again),
2565  * otherwise 0 if done.  In future, <0 returns should indicate error code.
2566  */
2567 static int xhci_handle_event(struct xhci_hcd *xhci)
2568 {
2569         union xhci_trb *event;
2570         int update_ptrs = 1;
2571         int ret;
2572
2573         if (!xhci->event_ring || !xhci->event_ring->dequeue) {
2574                 xhci->error_bitmask |= 1 << 1;
2575                 return 0;
2576         }
2577
2578         event = xhci->event_ring->dequeue;
2579         /* Does the HC or OS own the TRB? */
2580         if ((le32_to_cpu(event->event_cmd.flags) & TRB_CYCLE) !=
2581             xhci->event_ring->cycle_state) {
2582                 xhci->error_bitmask |= 1 << 2;
2583                 return 0;
2584         }
2585
2586         /*
2587          * Barrier between reading the TRB_CYCLE (valid) flag above and any
2588          * speculative reads of the event's flags/data below.
2589          */
2590         rmb();
2591         /* FIXME: Handle more event types. */
2592         switch ((le32_to_cpu(event->event_cmd.flags) & TRB_TYPE_BITMASK)) {
2593         case TRB_TYPE(TRB_COMPLETION):
2594                 handle_cmd_completion(xhci, &event->event_cmd);
2595                 break;
2596         case TRB_TYPE(TRB_PORT_STATUS):
2597                 handle_port_status(xhci, event);
2598                 update_ptrs = 0;
2599                 break;
2600         case TRB_TYPE(TRB_TRANSFER):
2601                 ret = handle_tx_event(xhci, &event->trans_event);
2602                 if (ret < 0)
2603                         xhci->error_bitmask |= 1 << 9;
2604                 else
2605                         update_ptrs = 0;
2606                 break;
2607         default:
2608                 if ((le32_to_cpu(event->event_cmd.flags) & TRB_TYPE_BITMASK) >=
2609                     TRB_TYPE(48))
2610                         handle_vendor_event(xhci, event);
2611                 else
2612                         xhci->error_bitmask |= 1 << 3;
2613         }
2614         /* Any of the above functions may drop and re-acquire the lock, so check
2615          * to make sure a watchdog timer didn't mark the host as non-responsive.
2616          */
2617         if (xhci->xhc_state & XHCI_STATE_DYING) {
2618                 xhci_dbg(xhci, "xHCI host dying, returning from "
2619                                 "event handler.\n");
2620                 return 0;
2621         }
2622
2623         if (update_ptrs)
2624                 /* Update SW event ring dequeue pointer */
2625                 inc_deq(xhci, xhci->event_ring, true);
2626
2627         /* Are there more items on the event ring?  Caller will call us again to
2628          * check.
2629          */
2630         return 1;
2631 }
2632
2633 /*
2634  * xHCI spec says we can get an interrupt, and if the HC has an error condition,
2635  * we might get bad data out of the event ring.  Section 4.10.2.7 has a list of
2636  * indicators of an event TRB error, but we check the status *first* to be safe.
2637  */
2638 irqreturn_t xhci_irq(struct usb_hcd *hcd)
2639 {
2640         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
2641         u32 status;
2642         union xhci_trb *trb;
2643         u64 temp_64;
2644         union xhci_trb *event_ring_deq;
2645         dma_addr_t deq;
2646
2647         spin_lock(&xhci->lock);
2648         trb = xhci->event_ring->dequeue;
2649         /* Check if the xHC generated the interrupt, or the irq is shared */
2650         status = xhci_readl(xhci, &xhci->op_regs->status);
2651         if (status == 0xffffffff)
2652                 goto hw_died;
2653
2654         if (!(status & STS_EINT)) {
2655                 spin_unlock(&xhci->lock);
2656                 return IRQ_NONE;
2657         }
2658         if (status & STS_FATAL) {
2659                 xhci_warn(xhci, "WARNING: Host System Error\n");
2660                 xhci_halt(xhci);
2661 hw_died:
2662                 spin_unlock(&xhci->lock);
2663                 return -ESHUTDOWN;
2664         }
2665
2666         /*
2667          * Clear the op reg interrupt status first,
2668          * so we can receive interrupts from other MSI-X interrupters.
2669          * Write 1 to clear the interrupt status.
2670          */
2671         status |= STS_EINT;
2672         xhci_writel(xhci, status, &xhci->op_regs->status);
2673         /* FIXME when MSI-X is supported and there are multiple vectors */
2674         /* Clear the MSI-X event interrupt status */
2675
2676         if (hcd->irq != -1) {
2677                 u32 irq_pending;
2678                 /* Acknowledge the PCI interrupt */
2679                 irq_pending = xhci_readl(xhci, &xhci->ir_set->irq_pending);
2680                 irq_pending |= IMAN_IP;
2681                 xhci_writel(xhci, irq_pending, &xhci->ir_set->irq_pending);
2682         }
2683
2684         if (xhci->xhc_state & XHCI_STATE_DYING) {
2685                 xhci_dbg(xhci, "xHCI dying, ignoring interrupt. "
2686                                 "Shouldn't IRQs be disabled?\n");
2687                 /* Clear the event handler busy flag (RW1C);
2688                  * the event ring should be empty.
2689                  */
2690                 temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
2691                 xhci_write_64(xhci, temp_64 | ERST_EHB,
2692                                 &xhci->ir_set->erst_dequeue);
2693                 spin_unlock(&xhci->lock);
2694
2695                 return IRQ_HANDLED;
2696         }
2697
2698         event_ring_deq = xhci->event_ring->dequeue;
2699         /* FIXME this should be a delayed service routine
2700          * that clears the EHB.
2701          */
2702         while (xhci_handle_event(xhci) > 0) {}
2703
2704         temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
2705         /* If necessary, update the HW's version of the event ring deq ptr. */
2706         if (event_ring_deq != xhci->event_ring->dequeue) {
2707                 deq = xhci_trb_virt_to_dma(xhci->event_ring->deq_seg,
2708                                 xhci->event_ring->dequeue);
2709                 if (deq == 0)
2710                         xhci_warn(xhci, "WARN something wrong with SW event "
2711                                         "ring dequeue ptr.\n");
2712                 /* Update HC event ring dequeue pointer */
2713                 temp_64 &= ERST_PTR_MASK;
2714                 temp_64 |= ((u64) deq & (u64) ~ERST_PTR_MASK);
2715         }
2716
2717         /* Clear the event handler busy flag (RW1C); event ring is empty. */
2718         temp_64 |= ERST_EHB;
2719         xhci_write_64(xhci, temp_64, &xhci->ir_set->erst_dequeue);
2720
2721         spin_unlock(&xhci->lock);
2722
2723         return IRQ_HANDLED;
2724 }
2725
2726 irqreturn_t xhci_msi_irq(int irq, struct usb_hcd *hcd)
2727 {
2728         irqreturn_t ret;
2729         struct xhci_hcd *xhci;
2730
2731         xhci = hcd_to_xhci(hcd);
2732         set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
2733         if (xhci->shared_hcd)
2734                 set_bit(HCD_FLAG_SAW_IRQ, &xhci->shared_hcd->flags);
2735
2736         ret = xhci_irq(hcd);
2737
2738         return ret;
2739 }
2740
2741 /****           Endpoint Ring Operations        ****/
2742
2743 /*
2744  * Generic function for queueing a TRB on a ring.
2745  * The caller must have checked to make sure there's room on the ring.
2746  *
2747  * @more_trbs_coming:   Will you enqueue more TRBs before calling
2748  *                      prepare_transfer()?
2749  */
2750 static void queue_trb(struct xhci_hcd *xhci, struct xhci_ring *ring,
2751                 bool consumer, bool more_trbs_coming, bool isoc,
2752                 u32 field1, u32 field2, u32 field3, u32 field4)
2753 {
2754         struct xhci_generic_trb *trb;
2755
2756         trb = &ring->enqueue->generic;
2757         trb->field[0] = cpu_to_le32(field1);
2758         trb->field[1] = cpu_to_le32(field2);
2759         trb->field[2] = cpu_to_le32(field3);
2760         trb->field[3] = cpu_to_le32(field4);
2761         inc_enq(xhci, ring, consumer, more_trbs_coming, isoc);
2762 }
2763
2764 /*
2765  * Does various checks on the endpoint ring, and makes it ready to queue num_trbs.
2766  * FIXME allocate segments if the ring is full.
2767  */
2768 static int prepare_ring(struct xhci_hcd *xhci, struct xhci_ring *ep_ring,
2769                 u32 ep_state, unsigned int num_trbs, bool isoc, gfp_t mem_flags)
2770 {
2771         /* Make sure the endpoint has been added to xHC schedule */
2772         switch (ep_state) {
2773         case EP_STATE_DISABLED:
2774                 /*
2775                  * USB core changed config/interfaces without notifying us,
2776                  * or hardware is reporting the wrong state.
2777                  */
2778                 xhci_warn(xhci, "WARN urb submitted to disabled ep\n");
2779                 return -ENOENT;
2780         case EP_STATE_ERROR:
2781                 xhci_warn(xhci, "WARN waiting for error on ep to be cleared\n");
2782                 /* FIXME event handling code for error needs to clear it */
2783                 /* XXX not sure if this should be -ENOENT or not */
2784                 return -EINVAL;
2785         case EP_STATE_HALTED:
2786                 xhci_dbg(xhci, "WARN halted endpoint, queueing URB anyway.\n");
2787         case EP_STATE_STOPPED:
2788         case EP_STATE_RUNNING:
2789                 break;
2790         default:
2791                 xhci_err(xhci, "ERROR unknown endpoint state for ep\n");
2792                 /*
2793                  * FIXME issue Configure Endpoint command to try to get the HC
2794                  * back into a known state.
2795                  */
2796                 return -EINVAL;
2797         }
2798         if (!room_on_ring(xhci, ep_ring, num_trbs)) {
2799                 /* FIXME allocate more room */
2800                 xhci_err(xhci, "ERROR no room on ep ring\n");
2801                 return -ENOMEM;
2802         }
2803
2804         if (enqueue_is_link_trb(ep_ring)) {
2805                 struct xhci_ring *ring = ep_ring;
2806                 union xhci_trb *next;
2807
2808                 next = ring->enqueue;
2809
2810                 while (last_trb(xhci, ring, ring->enq_seg, next)) {
2811                         /* If we're not dealing with 0.95 hardware or isoc rings
2812                          * on AMD 0.96 host, clear the chain bit.
2813                          */
2814                         if (!xhci_link_trb_quirk(xhci) && !(isoc &&
2815                                         (xhci->quirks & XHCI_AMD_0x96_HOST)))
2816                                 next->link.control &= cpu_to_le32(~TRB_CHAIN);
2817                         else
2818                                 next->link.control |= cpu_to_le32(TRB_CHAIN);
2819
2820                         wmb();
2821                         next->link.control ^= cpu_to_le32(TRB_CYCLE);
2822
2823                         /* Toggle the cycle bit after the last ring segment. */
2824                         if (last_trb_on_last_seg(xhci, ring, ring->enq_seg, next)) {
2825                                 ring->cycle_state = (ring->cycle_state ? 0 : 1);
2826                                 if (!in_interrupt()) {
2827                                         xhci_dbg(xhci, "queue_trb: Toggle cycle "
2828                                                 "state for ring %p = %i\n",
2829                                                 ring, (unsigned int)ring->cycle_state);
2830                                 }
2831                         }
2832                         ring->enq_seg = ring->enq_seg->next;
2833                         ring->enqueue = ring->enq_seg->trbs;
2834                         next = ring->enqueue;
2835                 }
2836         }
2837
2838         return 0;